Java Regex Character classes
| Character Class |
Description |
| [abc] |
a, b, or c (simple class) |
| [^abc] |
Any character except a, b, or c (negation) |
| [a-zA-Z] |
a through z or A through Z, inclusive (range) |
| [a-d[m-p]] |
a through d, or m through p: [a-dm-p] (union) |
| [a-z&&[def]] |
d, e, or f (intersection) |
| [a-z&&[^bc]] |
a through z, except for b and c: [ad-z] (subtraction) |
| [a-z&&[^m-p]] |
a through z, and not m through p: [a-lq-z](subtraction) |
Regex Character Class Example
package com.w3spoint;
import java.util.regex.Pattern;
public class RegexTest {
public static void main(String args[]){
//true (2nd char is j)
System.out.println(Pattern.matches(".j", "pj"));
//false (2nd char is not s)
System.out.println(Pattern.matches(".j", "ab"));
//false (s is not the last char)
System.out.println(Pattern.matches(".s", "msa"));
//false (has more than 2 char before s)
System.out.println(Pattern.matches(".s", "pjms"));
//true (3rd char is s)
System.out.println(Pattern.matches("..s", "pjs"));
}
} |
package com.w3spoint;
import java.util.regex.Pattern;
public class RegexTest {
public static void main(String args[]){
//true (2nd char is j)
System.out.println(Pattern.matches(".j", "pj"));
//false (2nd char is not s)
System.out.println(Pattern.matches(".j", "ab"));
//false (s is not the last char)
System.out.println(Pattern.matches(".s", "msa"));
//false (has more than 2 char before s)
System.out.println(Pattern.matches(".s", "pjms"));
//true (3rd char is s)
System.out.println(Pattern.matches("..s", "pjs"));
}
}
Output
true
false
false
false
true |
true
false
false
false
true
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