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 = "^(\\d{2}:\\d{2}:\\d{2}[.,]\\d{3})\\s-->\\s(\\d{2}:\\d{2}:\\d{2}[.,]\\d{3})\\n(.*(?:\\r?\\n(?!\\r?\\n).*)*)"; final String string = "WEBVTT\n\n" + "1\n" + "00:00:00.310 --> 00:00:02.540\n" + "Dans cette séquence, nous\n" + "allons voir pourquoi nos\n\n" + "2\n" + "00:00:02.550 --> 00:00:05.210\n" + "assistants personnels,\n" + "smartphones et tablettes, sont\n\n" + "3\n" + "00:00:05.210 --> 00:00:07.420\n" + "devenus tout\n" + "naturellement, en une dizaine d'années\n\n" + "4\n" + "00:00:07.420 --> 00:00:10.100\n" + "seulement, un point de collecte\n" + "majeur de données personnelles.\n\n" + "5\n" + "00:00:10.520 --> 00:00:13.140\n" + "Pourquoi le smartphone\n" + "intéresse-t-il tant de monde ?\n\n" + "6\n" + "00:00:15.690 --> 00:00:17.550\n" + "Tout d'abord, il faut\n" + "être conscient que dans un\n\n" + "7\n" + "00:00:17.550 --> 00:00:20.110\n" + "smartphone, 2 niveaux\n" + "existent. Il y a la partie visible\n\n" + "8\n" + "00:00:20.150 --> 00:00:23.440\n" + "avec son processeur dont on\n" + "va vanter les performances,\n\n" + "9\n" + "00:00:23.440 --> 00:00:26.260\n" + "le système d'exploitation\n" + "- dans ce module, nous nous"; 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