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Copyright 2020 t-io
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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package org.tio.utils.hutool;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* @author tanyaowu
* 2018年8月5日 下午8:34:06
*/
public class ReUtil {
/** 正则表达式匹配中文汉字 */
public final static String RE_CHINESE = "[\u4E00-\u9FFF]";
/** 正则表达式匹配中文字符串 */
public final static String RE_CHINESES = RE_CHINESE + "+";
/** 正则中需要被转义的关键字 */
public final static Set RE_KEYS = new HashSet<>();
static {
RE_KEYS.add('$');
RE_KEYS.add('(');
RE_KEYS.add(')');
RE_KEYS.add('*');
RE_KEYS.add('+');
RE_KEYS.add('.');
RE_KEYS.add('[');
RE_KEYS.add(']');
RE_KEYS.add('?');
RE_KEYS.add('\\');
RE_KEYS.add('^');
RE_KEYS.add('{');
RE_KEYS.add('}');
RE_KEYS.add('|');
}
/**
* 获得匹配的字符串，，获得正则中分组0的内容
*
* @param pattern 编译后的正则模式
* @param content 被匹配的内容
* @return 匹配后得到的字符串，未匹配返回null
* @since 3.1.2
*/
public static String getGroup0(Pattern pattern, String content) {
return get(pattern, content, 0);
}
/**
* 获得匹配的字符串，，获得正则中分组1的内容
*
* @param pattern 编译后的正则模式
* @param content 被匹配的内容
* @return 匹配后得到的字符串，未匹配返回null
* @since 3.1.2
*/
public static String getGroup1(Pattern pattern, String content) {
return get(pattern, content, 1);
}
/**
* 获得匹配的字符串
*
* @param pattern 编译后的正则模式
* @param content 被匹配的内容
* @param groupIndex 匹配正则的分组序号
* @return 匹配后得到的字符串，未匹配返回null
*/
public static String get(Pattern pattern, String content, int groupIndex) {
if (null == content || null == pattern) {
return null;
}
final Matcher matcher = pattern.matcher(content);
if (matcher.find()) {
return matcher.group(groupIndex);
}
return null;
}
/**
* 获得匹配的字符串匹配到的所有分组
*
* @param pattern 编译后的正则模式
* @param content 被匹配的内容
* @return 匹配后得到的字符串数组，按照分组顺序依次列出，未匹配到返回空列表，任何一个参数为null返回null
* @since 3.1.0
*/
public static List getAllGroups(Pattern pattern, String content) {
return getAllGroups(pattern, content, true);
}
/**
* 获得匹配的字符串匹配到的所有分组
*
* @param pattern 编译后的正则模式
* @param content 被匹配的内容
* @param withGroup0 是否包括分组0，此分组表示全匹配的信息
* @return 匹配后得到的字符串数组，按照分组顺序依次列出，未匹配到返回空列表，任何一个参数为null返回null
* @since 4.0.13
*/
public static List getAllGroups(Pattern pattern, String content, boolean withGroup0) {
if (null == content || null == pattern) {
return null;
}
ArrayList result = new ArrayList<>();
final Matcher matcher = pattern.matcher(content);
if (matcher.find()) {
final int startGroup = withGroup0 ? 0 : 1;
final int groupCount = matcher.groupCount();
for (int i = startGroup; i <= groupCount; i++) {
result.add(matcher.group(i));
}
}
return result;
}
/**
* 删除匹配的第一个内容
*
* @param pattern 正则
* @param content 被匹配的内容
* @return 删除后剩余的内容
*/
public static String delFirst(Pattern pattern, String content) {
if (null == pattern || StrUtil.isBlank(content)) {
return content;
}
return pattern.matcher(content).replaceFirst(StrUtil.EMPTY);
}
/**
* 删除匹配的全部内容
*
* @param pattern 正则
* @param content 被匹配的内容
* @return 删除后剩余的内容
*/
public static String delAll(Pattern pattern, String content) {
if (null == pattern || StrUtil.isBlank(content)) {
return content;
}
return pattern.matcher(content).replaceAll(StrUtil.EMPTY);
}
/**
* 取得内容中匹配的所有结果，获得匹配的所有结果中正则对应分组0的内容
*
* @param regex 正则
* @param content 被查找的内容
* @return 结果列表
* @since 3.1.2
*/
public static List findAllGroup0(String regex, String content) {
return findAll(regex, content, 0);
}
/**
* 取得内容中匹配的所有结果，获得匹配的所有结果中正则对应分组1的内容
*
* @param regex 正则
* @param content 被查找的内容
* @return 结果列表
* @since 3.1.2
*/
public static List findAllGroup1(String regex, String content) {
return findAll(regex, content, 1);
}
/**
* 取得内容中匹配的所有结果
*
* @param regex 正则
* @param content 被查找的内容
* @param group 正则的分组
* @return 结果列表
* @since 3.0.6
*/
public static List findAll(String regex, String content, int group) {
return findAll(regex, content, group, new ArrayList());
}
/**
* 取得内容中匹配的所有结果
*
* @param 集合类型
* @param regex 正则
* @param content 被查找的内容
* @param group 正则的分组
* @param collection 返回的集合类型
* @return 结果集
*/
public static > T findAll(String regex, String content, int group, T collection) {
if (null == regex) {
return null;
}
Pattern pattern = Pattern.compile(regex, Pattern.DOTALL);
return findAll(pattern, content, group, collection);
}
/**
* 取得内容中匹配的所有结果，获得匹配的所有结果中正则对应分组0的内容
*
* @param pattern 编译后的正则模式
* @param content 被查找的内容
* @return 结果列表
* @since 3.1.2
*/
public static List findAllGroup0(Pattern pattern, String content) {
return findAll(pattern, content, 0);
}
/**
* 取得内容中匹配的所有结果，获得匹配的所有结果中正则对应分组1的内容
*
* @param pattern 编译后的正则模式
* @param content 被查找的内容
* @return 结果列表
* @since 3.1.2
*/
public static List findAllGroup1(Pattern pattern, String content) {
return findAll(pattern, content, 1);
}
/**
* 取得内容中匹配的所有结果
*
* @param pattern 编译后的正则模式
* @param content 被查找的内容
* @param group 正则的分组
* @return 结果列表
* @since 3.0.6
*/
public static List findAll(Pattern pattern, String content, int group) {
return findAll(pattern, content, group, new ArrayList());
}
/**
* 取得内容中匹配的所有结果
*
* @param 集合类型
* @param pattern 编译后的正则模式
* @param content 被查找的内容
* @param group 正则的分组
* @param collection 返回的集合类型
* @return 结果集
*/
public static > T findAll(Pattern pattern, String content, int group, T collection) {
if (null == pattern || null == content) {
return null;
}
if (null == collection) {
throw new NullPointerException("Null collection param provided!");
}
Matcher matcher = pattern.matcher(content);
while (matcher.find()) {
collection.add(matcher.group(group));
}
return collection;
}
/**
* 计算指定字符串中，匹配pattern的个数
*
* @param pattern 编译后的正则模式
* @param content 被查找的内容
* @return 匹配个数
*/
public static int count(Pattern pattern, String content) {
if (null == pattern || null == content) {
return 0;
}
int count = 0;
Matcher matcher = pattern.matcher(content);
while (matcher.find()) {
count++;
}
return count;
}
/**
* 指定内容中是否有表达式匹配的内容
*
* @param pattern 编译后的正则模式
* @param content 被查找的内容
* @return 指定内容中是否有表达式匹配的内容
* @since 3.3.1
*/
public static boolean contains(Pattern pattern, String content) {
if (null == pattern || null == content) {
return false;
}
return pattern.matcher(content).find();
}
/**
* 给定内容是否匹配正则
*
* @param regex 正则
* @param content 内容
* @return 正则为null或者""则不检查，返回true，内容为null返回false
*/
public static boolean isMatch(String regex, String content) {
if (content == null) {
// 提供null的字符串为不匹配
return false;
}
if (StrUtil.isEmpty(regex)) {
// 正则不存在则为全匹配
return true;
}
// Pattern pattern = Pattern.compile(regex, Pattern.DOTALL);
final Pattern pattern = Pattern.compile(regex, Pattern.DOTALL);//;PatternPool.get(regex, Pattern.DOTALL);
return isMatch(pattern, content);
}
/**
* 给定内容是否匹配正则
*
* @param pattern 模式
* @param content 内容
* @return 正则为null或者""则不检查，返回true，内容为null返回false
*/
public static boolean isMatch(Pattern pattern, String content) {
if (content == null || pattern == null) {
// 提供null的字符串为不匹配
return false;
}
return pattern.matcher(content).matches();
}
/**
* 正则替换指定值
* 通过正则查找到字符串，然后把匹配到的字符串加入到replacementTemplate中，$1表示分组1的字符串
*
* @param content 文本
* @param regex 正则
* @param replacementTemplate 替换的文本模板，可以使用$1类似的变量提取正则匹配出的内容
* @return 处理后的文本
*/
public static String replaceAll(String content, String regex, String replacementTemplate) {
final Pattern pattern = Pattern.compile(regex, Pattern.DOTALL);
return replaceAll(content, pattern, replacementTemplate);
}
/**
* 正则替换指定值
* 通过正则查找到字符串，然后把匹配到的字符串加入到replacementTemplate中，$1表示分组1的字符串
*
* @param content 文本
* @param pattern {@link Pattern}
* @param replacementTemplate 替换的文本模板，可以使用$1类似的变量提取正则匹配出的内容
* @return 处理后的文本
* @since 3.0.4
*/
public static String replaceAll(String content, Pattern pattern, String replacementTemplate) {
if (StrUtil.isEmpty(content)) {
return content;
}
final Matcher matcher = pattern.matcher(content);
boolean result = matcher.find();
if (result) {
final Set varNums = findAll(PatternPool.GROUP_VAR, replacementTemplate, 1, new HashSet());
final StringBuffer sb = new StringBuffer();
do {
String replacement = replacementTemplate;
for (String var : varNums) {
int group = Integer.parseInt(var);
replacement = replacement.replace("$" + var, matcher.group(group));
}
matcher.appendReplacement(sb, escape(replacement));
result = matcher.find();
} while (result);
matcher.appendTail(sb);
return sb.toString();
}
return content;
}
/**
* 转义字符，将正则的关键字转义
*
* @param c 字符
* @return 转义后的文本
*/
public static String escape(char c) {
final StringBuilder builder = new StringBuilder();
if (RE_KEYS.contains(c)) {
builder.append('\\');
}
builder.append(c);
return builder.toString();
}
/**
* 转义字符串，将正则的关键字转义
*
* @param content 文本
* @return 转义后的文本
*/
public static String escape(String content) {
if (StrUtil.isBlank(content)) {
return content;
}
final StringBuilder builder = new StringBuilder();
int len = content.length();
char current;
for (int i = 0; i < len; i++) {
current = content.charAt(i);
if (RE_KEYS.contains(current)) {
builder.append('\\');
}
builder.append(current);
}
return builder.toString();
}
}
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