Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
gm

Test String

Code Generator

Language

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "^(?!15).*"; final String string = "13\n" + "13.1\n" + "13.1.1\n" + "13.1.2\n" + "13.1.2\n" + "13.1.3\n" + "13.2\n" + "13.2.1\n" + "13.2.2\n" + "13.2.3\n" + "13.3\n" + "13.3.1\n" + "13.4\n" + "13.4\n" + "13.4.1\n" + "13.4.1\n" + "13.5\n" + "13.5.1\n" + "13.6\n" + "13.6.1\n" + "13.7\n" + "14\n" + "14.0.1\n" + "14.1\n" + "14.2\n" + "14.2\n" + "14.2.1\n" + "14.3\n" + "14.4\n" + "14.4.1\n" + "14.4.2\n" + "14.5\n" + "14.5.1\n" + "14.6 Beta 3\n" + "14.6 RC\n" + "14.6 RC 2\n" + "14.6\n" + "14.7 Beta 1\n" + "14.7 Beta 2\n" + "14.7 Beta 3\n" + "14.7 Beta 4\n" + "14.7 Beta 5\n" + "14.7 RC\n" + "14.7\n" + "14.7.1\n" + "14.8\n" + "14.8.1\n" + "15.0 Beta 1\n" + "15.0 Beta 2\n" + "15.0 Beta 2\n" + "15.0 Beta 3\n" + "15.0 Beta 4\n" + "15.0 Beta 5\n" + "15.0 Beta 6\n" + "15.0 Beta 7\n" + "15.0 Beta 8\n" + "15.0 RC\n" + "15\n" + "15.1 Beta 1\n" + "15.1 Beta 2\n" + "15.0.1\n" + "15.1 Beta 3\n" + "15.0.2\n" + "15.1 Beta 4\n" + "15.1 RC 1\n" + "15.1 RC 2\n" + "15.1\n" + "15.2 Beta 1\n" + "15.2 Beta 2\n" + "15.2 Beta 3\n" + "15.1.1\n" + "15.2 Beta 4\n" + "15.2 RC\n" + "15.2 RC 2\n" + "15.2\n" + "15.3 Beta 1\n" + "15.2.1\n" + "15.3 Beta 2\n" + "15.3 RC\n" + "15.3\n" + "15.4 Beta 1\n" + "15.4 Beta 2\n" + "15.3.1\n" + "15.4 Beta 3\n" + "15.4 Beta 4\n" + "15.4 Beta 5\n" + "15.4 RC\n" + "15.4\n" + "15.4.1\n" + "15.5 Beta 1\n" + "15.5 Beta 2\n" + "15.5 Beta 3\n" + "15.5 Beta 4\n" + "15.5 RC\n" + "15.5\n" + "15.6 Beta 1\n" + "15.6 Beta 2\n" + "15.6 Beta 3\n" + "15.6 Beta 4\n" + "15.6 Beta 5\n" + "15.6 RC\n" + "15.6 RC 2\n" + "15.6\n" + "15.6.1\n" + "15.7 RC\n" + "15.7\n" + "15.7.1 RC\n" + "15.7.1\n" + "15.7.2 RC\n" + "16.0 Beta 1\n" + "16.0 Beta 2\n" + "16.0 Beta 3\n" + "16.0 Beta 3\n" + "16.0 Public Beta 1\n" + "16.0 Beta 4\n" + "16.0 Public Beta 2\n" + "16.0 Beta 5\n" + "16.0 Public Beta 3\n" + "16.0 Beta 6\n" + "16.0 Public Beta 4\n" + "16.0 Beta 7\n" + "16.0 Public Beta 5\n" + "16.0 Beta 8\n" + "16.0 Public Beta 6\n" + "16.0 RC\n" + "16\n" + "16.1 Beta 1\n" + "16.0.1\n" + "16.1 Public Beta 1\n" + "16.1 Beta 2\n" + "16.1 Public Beta 2\n" + "16.0.2\n" + "16.1 Beta 3\n" + "16.1 Public Beta 3\n" + "16.1 Beta 4\n" + "16.1 Public Beta 4\n" + "16.0.3\n" + "16.1 Beta 5\n" + "16.1 Public Beta 5\n" + "16.1 RC\n" + "16.1\n" + "16.2 Beta 1\n" + "16.2 Public Beta 1\n" + "16.2 Beta 2\n" + "16.1.1\n" + "16.2 Public Beta 2\n" + "16.2 Beta 3\n" + "16.2 Public Beta 3\n" + "16.2 (a)\n" + "16.2 (b)\n" + "16.1.2\n" + "16.2 Beta 4\n" + "16.2 RC"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html