You can use the &&
operator to combine classes that define a sets of characters. It will only match characters common to both classes (intersection).
package org.kodejava.regex;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class CharacterClassIntersectionDemo {
public static void main(String[] args) {
// Define regex that will search characters from 'a' to 'z'
// and is a 'c' or 'a' or 't' character.
String regex = "[a-z&&[cat]]";
// Compiles the given regular expression into a pattern.
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(
"The quick brown fox jumps over the lazy dog");
// Find every match and print it
while (matcher.find()) {
System.out.format("Text \"%s\" found at %d to %d.%n",
matcher.group(), matcher.start(), matcher.end());
}
}
}
The program print the following result:
Text "c" found at 7 to 8.
Text "t" found at 31 to 32.
Text "a" found at 36 to 37.
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