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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.lang3;

import java.io.IOException;
import java.io.Writer;

import org.apache.commons.lang3.text.translate.AggregateTranslator;
import org.apache.commons.lang3.text.translate.CharSequenceTranslator;
import org.apache.commons.lang3.text.translate.EntityArrays;
import org.apache.commons.lang3.text.translate.JavaUnicodeEscaper;
import org.apache.commons.lang3.text.translate.LookupTranslator;
import org.apache.commons.lang3.text.translate.NumericEntityEscaper;
import org.apache.commons.lang3.text.translate.NumericEntityUnescaper;
import org.apache.commons.lang3.text.translate.OctalUnescaper;
import org.apache.commons.lang3.text.translate.UnicodeUnescaper;
import org.apache.commons.lang3.text.translate.UnicodeUnpairedSurrogateRemover;

/**
 * 

Escapes and unescapes {@code String}s for * Java, Java Script, HTML and XML.

* *

#ThreadSafe#

* @since 2.0 * @deprecated as of 3.6, use commons-text * * StringEscapeUtils instead */ @Deprecated public class StringEscapeUtils { /* ESCAPE TRANSLATORS */ /** * Translator object for escaping Java. * * While {@link #escapeJava(String)} is the expected method of use, this * object allows the Java escaping functionality to be used * as the foundation for a custom translator. * * @since 3.0 */ public static final CharSequenceTranslator ESCAPE_JAVA = new LookupTranslator( new String[][] { {"\"", "\\\""}, {"\\", "\\\\"}, }).with( new LookupTranslator(EntityArrays.JAVA_CTRL_CHARS_ESCAPE()) ).with( JavaUnicodeEscaper.outsideOf(32, 0x7f) ); /** * Translator object for escaping EcmaScript/JavaScript. * * While {@link #escapeEcmaScript(String)} is the expected method of use, this * object allows the EcmaScript escaping functionality to be used * as the foundation for a custom translator. * * @since 3.0 */ public static final CharSequenceTranslator ESCAPE_ECMASCRIPT = new AggregateTranslator( new LookupTranslator( new String[][] { {"'", "\\'"}, {"\"", "\\\""}, {"\\", "\\\\"}, {"/", "\\/"} }), new LookupTranslator(EntityArrays.JAVA_CTRL_CHARS_ESCAPE()), JavaUnicodeEscaper.outsideOf(32, 0x7f) ); /** * Translator object for escaping Json. * * While {@link #escapeJson(String)} is the expected method of use, this * object allows the Json escaping functionality to be used * as the foundation for a custom translator. * * @since 3.2 */ public static final CharSequenceTranslator ESCAPE_JSON = new AggregateTranslator( new LookupTranslator( new String[][] { {"\"", "\\\""}, {"\\", "\\\\"}, {"/", "\\/"} }), new LookupTranslator(EntityArrays.JAVA_CTRL_CHARS_ESCAPE()), JavaUnicodeEscaper.outsideOf(32, 0x7f) ); /** * Translator object for escaping XML. * * While {@link #escapeXml(String)} is the expected method of use, this * object allows the XML escaping functionality to be used * as the foundation for a custom translator. * * @since 3.0 * @deprecated use {@link #ESCAPE_XML10} or {@link #ESCAPE_XML11} instead. */ @Deprecated public static final CharSequenceTranslator ESCAPE_XML = new AggregateTranslator( new LookupTranslator(EntityArrays.BASIC_ESCAPE()), new LookupTranslator(EntityArrays.APOS_ESCAPE()) ); /** * Translator object for escaping XML 1.0. * * While {@link #escapeXml10(String)} is the expected method of use, this * object allows the XML escaping functionality to be used * as the foundation for a custom translator. * * @since 3.3 */ public static final CharSequenceTranslator ESCAPE_XML10 = new AggregateTranslator( new LookupTranslator(EntityArrays.BASIC_ESCAPE()), new LookupTranslator(EntityArrays.APOS_ESCAPE()), new LookupTranslator( new String[][] { { "\u0000", StringUtils.EMPTY }, { "\u0001", StringUtils.EMPTY }, { "\u0002", StringUtils.EMPTY }, { "\u0003", StringUtils.EMPTY }, { "\u0004", StringUtils.EMPTY }, { "\u0005", StringUtils.EMPTY }, { "\u0006", StringUtils.EMPTY }, { "\u0007", StringUtils.EMPTY }, { "\u0008", StringUtils.EMPTY }, { "\u000b", StringUtils.EMPTY }, { "\u000c", StringUtils.EMPTY }, { "\u000e", StringUtils.EMPTY }, { "\u000f", StringUtils.EMPTY }, { "\u0010", StringUtils.EMPTY }, { "\u0011", StringUtils.EMPTY }, { "\u0012", StringUtils.EMPTY }, { "\u0013", StringUtils.EMPTY }, { "\u0014", StringUtils.EMPTY }, { "\u0015", StringUtils.EMPTY }, { "\u0016", StringUtils.EMPTY }, { "\u0017", StringUtils.EMPTY }, { "\u0018", StringUtils.EMPTY }, { "\u0019", StringUtils.EMPTY }, { "\u001a", StringUtils.EMPTY }, { "\u001b", StringUtils.EMPTY }, { "\u001c", StringUtils.EMPTY }, { "\u001d", StringUtils.EMPTY }, { "\u001e", StringUtils.EMPTY }, { "\u001f", StringUtils.EMPTY }, { "\ufffe", StringUtils.EMPTY }, { "\uffff", StringUtils.EMPTY } }), NumericEntityEscaper.between(0x7f, 0x84), NumericEntityEscaper.between(0x86, 0x9f), new UnicodeUnpairedSurrogateRemover() ); /** * Translator object for escaping XML 1.1. * * While {@link #escapeXml11(String)} is the expected method of use, this * object allows the XML escaping functionality to be used * as the foundation for a custom translator. * * @since 3.3 */ public static final CharSequenceTranslator ESCAPE_XML11 = new AggregateTranslator( new LookupTranslator(EntityArrays.BASIC_ESCAPE()), new LookupTranslator(EntityArrays.APOS_ESCAPE()), new LookupTranslator( new String[][] { { "\u0000", StringUtils.EMPTY }, { "\u000b", " " }, { "\u000c", " " }, { "\ufffe", StringUtils.EMPTY }, { "\uffff", StringUtils.EMPTY } }), NumericEntityEscaper.between(0x1, 0x8), NumericEntityEscaper.between(0xe, 0x1f), NumericEntityEscaper.between(0x7f, 0x84), NumericEntityEscaper.between(0x86, 0x9f), new UnicodeUnpairedSurrogateRemover() ); /** * Translator object for escaping HTML version 3.0. * * While {@link #escapeHtml3(String)} is the expected method of use, this * object allows the HTML escaping functionality to be used * as the foundation for a custom translator. * * @since 3.0 */ public static final CharSequenceTranslator ESCAPE_HTML3 = new AggregateTranslator( new LookupTranslator(EntityArrays.BASIC_ESCAPE()), new LookupTranslator(EntityArrays.ISO8859_1_ESCAPE()) ); /** * Translator object for escaping HTML version 4.0. * * While {@link #escapeHtml4(String)} is the expected method of use, this * object allows the HTML escaping functionality to be used * as the foundation for a custom translator. * * @since 3.0 */ public static final CharSequenceTranslator ESCAPE_HTML4 = new AggregateTranslator( new LookupTranslator(EntityArrays.BASIC_ESCAPE()), new LookupTranslator(EntityArrays.ISO8859_1_ESCAPE()), new LookupTranslator(EntityArrays.HTML40_EXTENDED_ESCAPE()) ); /** * Translator object for escaping individual Comma Separated Values. * * While {@link #escapeCsv(String)} is the expected method of use, this * object allows the CSV escaping functionality to be used * as the foundation for a custom translator. * * @since 3.0 */ public static final CharSequenceTranslator ESCAPE_CSV = new CsvEscaper(); // TODO: Create a parent class - 'SinglePassTranslator' ? // It would handle the index checking + length returning, // and could also have an optimization check method. static class CsvEscaper extends CharSequenceTranslator { private static final char CSV_DELIMITER = ','; private static final char CSV_QUOTE = '"'; private static final String CSV_QUOTE_STR = String.valueOf(CSV_QUOTE); private static final char[] CSV_SEARCH_CHARS = new char[] {CSV_DELIMITER, CSV_QUOTE, CharUtils.CR, CharUtils.LF}; @Override public int translate(final CharSequence input, final int index, final Writer out) throws IOException { if(index != 0) { throw new IllegalStateException("CsvEscaper should never reach the [1] index"); } if (StringUtils.containsNone(input.toString(), CSV_SEARCH_CHARS)) { out.write(input.toString()); } else { out.write(CSV_QUOTE); out.write(StringUtils.replace(input.toString(), CSV_QUOTE_STR, CSV_QUOTE_STR + CSV_QUOTE_STR)); out.write(CSV_QUOTE); } return Character.codePointCount(input, 0, input.length()); } } /* UNESCAPE TRANSLATORS */ /** * Translator object for unescaping escaped Java. * * While {@link #unescapeJava(String)} is the expected method of use, this * object allows the Java unescaping functionality to be used * as the foundation for a custom translator. * * @since 3.0 */ // TODO: throw "illegal character: \92" as an Exception if a \ on the end of the Java (as per the compiler)? public static final CharSequenceTranslator UNESCAPE_JAVA = new AggregateTranslator( new OctalUnescaper(), // .between('\1', '\377'), new UnicodeUnescaper(), new LookupTranslator(EntityArrays.JAVA_CTRL_CHARS_UNESCAPE()), new LookupTranslator( new String[][] { {"\\\\", "\\"}, {"\\\"", "\""}, {"\\'", "'"}, {"\\", ""} }) ); /** * Translator object for unescaping escaped EcmaScript. * * While {@link #unescapeEcmaScript(String)} is the expected method of use, this * object allows the EcmaScript unescaping functionality to be used * as the foundation for a custom translator. * * @since 3.0 */ public static final CharSequenceTranslator UNESCAPE_ECMASCRIPT = UNESCAPE_JAVA; /** * Translator object for unescaping escaped Json. * * While {@link #unescapeJson(String)} is the expected method of use, this * object allows the Json unescaping functionality to be used * as the foundation for a custom translator. * * @since 3.2 */ public static final CharSequenceTranslator UNESCAPE_JSON = UNESCAPE_JAVA; /** * Translator object for unescaping escaped HTML 3.0. * * While {@link #unescapeHtml3(String)} is the expected method of use, this * object allows the HTML unescaping functionality to be used * as the foundation for a custom translator. * * @since 3.0 */ public static final CharSequenceTranslator UNESCAPE_HTML3 = new AggregateTranslator( new LookupTranslator(EntityArrays.BASIC_UNESCAPE()), new LookupTranslator(EntityArrays.ISO8859_1_UNESCAPE()), new NumericEntityUnescaper() ); /** * Translator object for unescaping escaped HTML 4.0. * * While {@link #unescapeHtml4(String)} is the expected method of use, this * object allows the HTML unescaping functionality to be used * as the foundation for a custom translator. * * @since 3.0 */ public static final CharSequenceTranslator UNESCAPE_HTML4 = new AggregateTranslator( new LookupTranslator(EntityArrays.BASIC_UNESCAPE()), new LookupTranslator(EntityArrays.ISO8859_1_UNESCAPE()), new LookupTranslator(EntityArrays.HTML40_EXTENDED_UNESCAPE()), new NumericEntityUnescaper() ); /** * Translator object for unescaping escaped XML. * * While {@link #unescapeXml(String)} is the expected method of use, this * object allows the XML unescaping functionality to be used * as the foundation for a custom translator. * * @since 3.0 */ public static final CharSequenceTranslator UNESCAPE_XML = new AggregateTranslator( new LookupTranslator(EntityArrays.BASIC_UNESCAPE()), new LookupTranslator(EntityArrays.APOS_UNESCAPE()), new NumericEntityUnescaper() ); /** * Translator object for unescaping escaped Comma Separated Value entries. * * While {@link #unescapeCsv(String)} is the expected method of use, this * object allows the CSV unescaping functionality to be used * as the foundation for a custom translator. * * @since 3.0 */ public static final CharSequenceTranslator UNESCAPE_CSV = new CsvUnescaper(); static class CsvUnescaper extends CharSequenceTranslator { private static final char CSV_DELIMITER = ','; private static final char CSV_QUOTE = '"'; private static final String CSV_QUOTE_STR = String.valueOf(CSV_QUOTE); private static final char[] CSV_SEARCH_CHARS = new char[] {CSV_DELIMITER, CSV_QUOTE, CharUtils.CR, CharUtils.LF}; @Override public int translate(final CharSequence input, final int index, final Writer out) throws IOException { if(index != 0) { throw new IllegalStateException("CsvUnescaper should never reach the [1] index"); } if ( input.charAt(0) != CSV_QUOTE || input.charAt(input.length() - 1) != CSV_QUOTE ) { out.write(input.toString()); return Character.codePointCount(input, 0, input.length()); } // strip quotes final String quoteless = input.subSequence(1, input.length() - 1).toString(); if ( StringUtils.containsAny(quoteless, CSV_SEARCH_CHARS) ) { // deal with escaped quotes; ie) "" out.write(StringUtils.replace(quoteless, CSV_QUOTE_STR + CSV_QUOTE_STR, CSV_QUOTE_STR)); } else { out.write(input.toString()); } return Character.codePointCount(input, 0, input.length()); } } /* Helper functions */ /** *

{@code StringEscapeUtils} instances should NOT be constructed in * standard programming.

* *

Instead, the class should be used as:

*
StringEscapeUtils.escapeJava("foo");
* *

This constructor is public to permit tools that require a JavaBean * instance to operate.

*/ public StringEscapeUtils() { super(); } // Java and JavaScript //-------------------------------------------------------------------------- /** *

Escapes the characters in a {@code String} using Java String rules.

* *

Deals correctly with quotes and control-chars (tab, backslash, cr, ff, etc.)

* *

So a tab becomes the characters {@code '\\'} and * {@code 't'}.

* *

The only difference between Java strings and JavaScript strings * is that in JavaScript, a single quote and forward-slash (/) are escaped.

* *

Example:

*
     * input string: He didn't say, "Stop!"
     * output string: He didn't say, \"Stop!\"
     * 
* * @param input String to escape values in, may be null * @return String with escaped values, {@code null} if null string input */ public static final String escapeJava(final String input) { return ESCAPE_JAVA.translate(input); } /** *

Escapes the characters in a {@code String} using EcmaScript String rules.

*

Escapes any values it finds into their EcmaScript String form. * Deals correctly with quotes and control-chars (tab, backslash, cr, ff, etc.)

* *

So a tab becomes the characters {@code '\\'} and * {@code 't'}.

* *

The only difference between Java strings and EcmaScript strings * is that in EcmaScript, a single quote and forward-slash (/) are escaped.

* *

Note that EcmaScript is best known by the JavaScript and ActionScript dialects.

* *

Example:

*
     * input string: He didn't say, "Stop!"
     * output string: He didn\'t say, \"Stop!\"
     * 
* * @param input String to escape values in, may be null * @return String with escaped values, {@code null} if null string input * * @since 3.0 */ public static final String escapeEcmaScript(final String input) { return ESCAPE_ECMASCRIPT.translate(input); } /** *

Escapes the characters in a {@code String} using Json String rules.

*

Escapes any values it finds into their Json String form. * Deals correctly with quotes and control-chars (tab, backslash, cr, ff, etc.)

* *

So a tab becomes the characters {@code '\\'} and * {@code 't'}.

* *

The only difference between Java strings and Json strings * is that in Json, forward-slash (/) is escaped.

* *

See http://www.ietf.org/rfc/rfc4627.txt for further details.

* *

Example:

*
     * input string: He didn't say, "Stop!"
     * output string: He didn't say, \"Stop!\"
     * 
* * @param input String to escape values in, may be null * @return String with escaped values, {@code null} if null string input * * @since 3.2 */ public static final String escapeJson(final String input) { return ESCAPE_JSON.translate(input); } /** *

Unescapes any Java literals found in the {@code String}. * For example, it will turn a sequence of {@code '\'} and * {@code 'n'} into a newline character, unless the {@code '\'} * is preceded by another {@code '\'}.

* * @param input the {@code String} to unescape, may be null * @return a new unescaped {@code String}, {@code null} if null string input */ public static final String unescapeJava(final String input) { return UNESCAPE_JAVA.translate(input); } /** *

Unescapes any EcmaScript literals found in the {@code String}.

* *

For example, it will turn a sequence of {@code '\'} and {@code 'n'} * into a newline character, unless the {@code '\'} is preceded by another * {@code '\'}.

* * @see #unescapeJava(String) * @param input the {@code String} to unescape, may be null * @return A new unescaped {@code String}, {@code null} if null string input * * @since 3.0 */ public static final String unescapeEcmaScript(final String input) { return UNESCAPE_ECMASCRIPT.translate(input); } /** *

Unescapes any Json literals found in the {@code String}.

* *

For example, it will turn a sequence of {@code '\'} and {@code 'n'} * into a newline character, unless the {@code '\'} is preceded by another * {@code '\'}.

* * @see #unescapeJava(String) * @param input the {@code String} to unescape, may be null * @return A new unescaped {@code String}, {@code null} if null string input * * @since 3.2 */ public static final String unescapeJson(final String input) { return UNESCAPE_JSON.translate(input); } // HTML and XML //-------------------------------------------------------------------------- /** *

Escapes the characters in a {@code String} using HTML entities.

* *

* For example: *

*

"bread" & "butter"

* becomes: *

* "bread" & "butter". *

* *

Supports all known HTML 4.0 entities, including funky accents. * Note that the commonly used apostrophe escape character (') * is not a legal entity and so is not supported).

* * @param input the {@code String} to escape, may be null * @return a new escaped {@code String}, {@code null} if null string input * * @see ISO Entities * @see HTML 3.2 Character Entities for ISO Latin-1 * @see HTML 4.0 Character entity references * @see HTML 4.01 Character References * @see HTML 4.01 Code positions * * @since 3.0 */ public static final String escapeHtml4(final String input) { return ESCAPE_HTML4.translate(input); } /** *

Escapes the characters in a {@code String} using HTML entities.

*

Supports only the HTML 3.0 entities.

* * @param input the {@code String} to escape, may be null * @return a new escaped {@code String}, {@code null} if null string input * * @since 3.0 */ public static final String escapeHtml3(final String input) { return ESCAPE_HTML3.translate(input); } //----------------------------------------------------------------------- /** *

Unescapes a string containing entity escapes to a string * containing the actual Unicode characters corresponding to the * escapes. Supports HTML 4.0 entities.

* *

For example, the string {@code "<Français>"} * will become {@code ""}

* *

If an entity is unrecognized, it is left alone, and inserted * verbatim into the result string. e.g. {@code ">&zzzz;x"} will * become {@code ">&zzzz;x"}.

* * @param input the {@code String} to unescape, may be null * @return a new unescaped {@code String}, {@code null} if null string input * * @since 3.0 */ public static final String unescapeHtml4(final String input) { return UNESCAPE_HTML4.translate(input); } /** *

Unescapes a string containing entity escapes to a string * containing the actual Unicode characters corresponding to the * escapes. Supports only HTML 3.0 entities.

* * @param input the {@code String} to unescape, may be null * @return a new unescaped {@code String}, {@code null} if null string input * * @since 3.0 */ public static final String unescapeHtml3(final String input) { return UNESCAPE_HTML3.translate(input); } //----------------------------------------------------------------------- /** *

Escapes the characters in a {@code String} using XML entities.

* *

For example: {@code "bread" & "butter"} => * {@code "bread" & "butter"}. *

* *

Supports only the five basic XML entities (gt, lt, quot, amp, apos). * Does not support DTDs or external entities.

* *

Note that Unicode characters greater than 0x7f are as of 3.0, no longer * escaped. If you still wish this functionality, you can achieve it * via the following: * {@code StringEscapeUtils.ESCAPE_XML.with( NumericEntityEscaper.between(0x7f, Integer.MAX_VALUE) );}

* * @param input the {@code String} to escape, may be null * @return a new escaped {@code String}, {@code null} if null string input * @see #unescapeXml(java.lang.String) * @deprecated use {@link #escapeXml10(java.lang.String)} or {@link #escapeXml11(java.lang.String)} instead. */ @Deprecated public static final String escapeXml(final String input) { return ESCAPE_XML.translate(input); } /** *

Escapes the characters in a {@code String} using XML entities.

* *

For example: {@code "bread" & "butter"} => * {@code "bread" & "butter"}. *

* *

Note that XML 1.0 is a text-only format: it cannot represent control * characters or unpaired Unicode surrogate codepoints, even after escaping. * {@code escapeXml10} will remove characters that do not fit in the * following ranges:

* *

{@code #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]}

* *

Though not strictly necessary, {@code escapeXml10} will escape * characters in the following ranges:

* *

{@code [#x7F-#x84] | [#x86-#x9F]}

* *

The returned string can be inserted into a valid XML 1.0 or XML 1.1 * document. If you want to allow more non-text characters in an XML 1.1 * document, use {@link #escapeXml11(String)}.

* * @param input the {@code String} to escape, may be null * @return a new escaped {@code String}, {@code null} if null string input * @see #unescapeXml(java.lang.String) * @since 3.3 */ public static String escapeXml10(final String input) { return ESCAPE_XML10.translate(input); } /** *

Escapes the characters in a {@code String} using XML entities.

* *

For example: {@code "bread" & "butter"} => * {@code "bread" & "butter"}. *

* *

XML 1.1 can represent certain control characters, but it cannot represent * the null byte or unpaired Unicode surrogate codepoints, even after escaping. * {@code escapeXml11} will remove characters that do not fit in the following * ranges:

* *

{@code [#x1-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]}

* *

{@code escapeXml11} will escape characters in the following ranges:

* *

{@code [#x1-#x8] | [#xB-#xC] | [#xE-#x1F] | [#x7F-#x84] | [#x86-#x9F]}

* *

The returned string can be inserted into a valid XML 1.1 document. Do not * use it for XML 1.0 documents.

* * @param input the {@code String} to escape, may be null * @return a new escaped {@code String}, {@code null} if null string input * @see #unescapeXml(java.lang.String) * @since 3.3 */ public static String escapeXml11(final String input) { return ESCAPE_XML11.translate(input); } //----------------------------------------------------------------------- /** *

Unescapes a string containing XML entity escapes to a string * containing the actual Unicode characters corresponding to the * escapes.

* *

Supports only the five basic XML entities (gt, lt, quot, amp, apos). * Does not support DTDs or external entities.

* *

Note that numerical \\u Unicode codes are unescaped to their respective * Unicode characters. This may change in future releases.

* * @param input the {@code String} to unescape, may be null * @return a new unescaped {@code String}, {@code null} if null string input * @see #escapeXml(String) * @see #escapeXml10(String) * @see #escapeXml11(String) */ public static final String unescapeXml(final String input) { return UNESCAPE_XML.translate(input); } //----------------------------------------------------------------------- /** *

Returns a {@code String} value for a CSV column enclosed in double quotes, * if required.

* *

If the value contains a comma, newline or double quote, then the * String value is returned enclosed in double quotes.

* *

Any double quote characters in the value are escaped with another double quote.

* *

If the value does not contain a comma, newline or double quote, then the * String value is returned unchanged.

* * see Wikipedia and * RFC 4180. * * @param input the input CSV column String, may be null * @return the input String, enclosed in double quotes if the value contains a comma, * newline or double quote, {@code null} if null string input * @since 2.4 */ public static final String escapeCsv(final String input) { return ESCAPE_CSV.translate(input); } /** *

Returns a {@code String} value for an unescaped CSV column.

* *

If the value is enclosed in double quotes, and contains a comma, newline * or double quote, then quotes are removed. *

* *

Any double quote escaped characters (a pair of double quotes) are unescaped * to just one double quote.

* *

If the value is not enclosed in double quotes, or is and does not contain a * comma, newline or double quote, then the String value is returned unchanged.

* * see Wikipedia and * RFC 4180. * * @param input the input CSV column String, may be null * @return the input String, with enclosing double quotes removed and embedded double * quotes unescaped, {@code null} if null string input * @since 2.4 */ public static final String unescapeCsv(final String input) { return UNESCAPE_CSV.translate(input); } }




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