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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.checker.regex;

import java.util.regex.MatchResult;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.checkerframework.checker.regex.qual.Regex;
import org.checkerframework.common.basetype.BaseTypeChecker;
import org.checkerframework.framework.qual.RelevantJavaTypes;
import org.checkerframework.framework.qual.StubFiles;

/**
 * A type-checker plug-in for the {@link Regex} qualifier that finds syntactically invalid regular
 * expressions.
 *
 * @checker_framework.manual #regex-checker Regex Checker
 */
@StubFiles("apache-xerces.astub")
@RelevantJavaTypes({
  CharSequence.class,
  // javax.swing.text.Segment.class
  char.class,
  Character.class,
  Pattern.class,
  Matcher.class,
  MatchResult.class
})
public class RegexChecker extends BaseTypeChecker {}