Regular Expressions 101

Save & Share

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
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 = "(?<phase>[0-9]+([,|.]?[0-9]+)?)[\\t](?<voltage>[0-9]+([,|.]?[0-9]+)?)[\\t](?<fault>[0-9]+([,|.]?[0-9]+)?)[\\t](?<PD>[0-9]+([,|.]?[0-9]+)?)"; final String string = "Fault location:\n" + "Cable-length (m): 266\n" + "Phase Voltage(kV) Fault(m): PD (pC):\n" + "1 11.0 141.452 142.857 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_11kV_2016-08-17-11'04'05.loc\n" + "1 11.0 141.452 190.476 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_11kV_2016-08-17-11'04'19.loc\n" + "1 11.0 141.452 161.905 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_11kV_2016-08-17-11'04'19.loc\n" + "1 11.0 139.673 171.429 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_11kV_2016-08-17-11'04'33.loc\n" + "1 11.0 141.452 152.381 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_11kV_2016-08-17-11'04'33.loc\n" + "1 13.0 140.562 295.238 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_13kV_2016-08-17-11'05'34.loc\n" + "1 13.0 137.004 285.714 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_13kV_2016-08-17-11'05'34.loc\n" + "1 13.0 140.562 238.095 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_13kV_2016-08-17-11'05'34.loc\n" + "1 13.0 142.341 200.000 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_13kV_2016-08-17-11'05'34.loc\n" + "1 13.0 140.562 333.333 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_13kV_2016-08-17-11'05'50.loc\n" + "1 13.0 139.673 314.286 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_13kV_2016-08-17-11'05'50.loc\n" + "3 13.0 136.114 228.571 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_13kV_2016-08-17-11'14'39.loc\n" + "1 13.0 136.114 171.429 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_13kV_2016-08-17-11'05'50.loc\n" + "1 13.0 141.452 276.190 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_13kV_2016-08-17-11'06'06.loc\n" + "1 13.0 139.673 180.952 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_13kV_2016-08-17-11'06'06.loc\n" + "2 9.0 141.452 142.857 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_9kV_2016-08-17-11'08'58.loc\n" + "2 11.0 136.114 304.762 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_11kV_2016-08-17-11'09'13.loc\n" + "2 11.0 140.562 209.524 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_11kV_2016-08-17-11'09'13.loc\n" + "2 11.0 138.783 285.714 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_11kV_2016-08-17-11'09'30.loc\n" + "2 11.0 140.562 219.048 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_11kV_2016-08-17-11'09'30.loc\n" + "2 11.0 139.673 333.333 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_11kV_2016-08-17-11'09'45.loc\n" + "2 11.0 137.004 238.095 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_11kV_2016-08-17-11'09'45.loc\n" + "2 13.0 140.562 447.619 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_13kV_2016-08-17-11'10'00.loc\n" + "2 13.0 139.673 352.381 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_13kV_2016-08-17-11'10'00.loc\n" + "2 13.0 137.893 323.810 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_13kV_2016-08-17-11'10'00.loc\n" + "2 13.0 134.335 171.429 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_13kV_2016-08-17-11'10'00.loc\n" + "2 13.0 140.562 447.619 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_13kV_2016-08-17-11'10'16.loc\n" + "2 13.0 140.562 419.048 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_13kV_2016-08-17-11'10'16.loc\n" + "2 13.0 138.783 390.476 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_13kV_2016-08-17-11'10'16.loc\n" + "2 13.0 138.783 304.762 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_13kV_2016-08-17-11'10'16.loc\n" + "2 13.0 140.562 200.000 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_13kV_2016-08-17-11'10'16.loc\n" + "2 13.0 140.562 447.619 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_13kV_2016-08-17-11'10'41.loc\n" + "2 13.0 138.783 409.524 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_13kV_2016-08-17-11'10'41.loc\n" + "2 13.0 139.673 361.905 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_13kV_2016-08-17-11'10'41.loc\n" + "2 13.0 137.893 352.381 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L2_13kV_2016-08-17-11'10'41.loc\n" + "3 9.0 139.673 142.857 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_9kV_2016-08-17-11'13'10.loc\n" + "3 11.0 120.101 342.857 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_11kV_2016-08-17-11'13'27.loc\n" + "3 11.0 137.893 171.429 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_11kV_2016-08-17-11'13'27.loc\n" + "3 11.0 139.673 219.048 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_11kV_2016-08-17-11'13'43.loc\n" + "3 11.0 139.673 190.476 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_11kV_2016-08-17-11'13'43.loc\n" + "3 11.0 139.673 304.762 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_11kV_2016-08-17-11'13'57.loc\n" + "3 11.0 139.673 161.905 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_11kV_2016-08-17-11'13'57.loc\n" + "3 13.0 137.893 380.952 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_13kV_2016-08-17-11'14'11.loc\n" + "3 13.0 140.562 352.381 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_13kV_2016-08-17-11'14'11.loc\n" + "3 13.0 139.673 352.381 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_13kV_2016-08-17-11'14'11.loc\n" + "3 13.0 137.893 333.333 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_13kV_2016-08-17-11'14'11.loc\n" + "3 13.0 140.562 200.000 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_13kV_2016-08-17-11'14'11.loc\n" + "3 13.0 139.673 428.571 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_13kV_2016-08-17-11'14'25.loc\n" + "3 13.0 140.562 409.524 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_13kV_2016-08-17-11'14'25.loc\n" + "3 13.0 137.004 323.810 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_13kV_2016-08-17-11'14'25.loc\n" + "3 13.0 136.114 209.524 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_13kV_2016-08-17-11'14'25.loc\n" + "3 13.0 120.101 628.571 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_13kV_2016-08-17-11'14'39.loc\n" + "3 13.0 140.562 314.286 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_13kV_2016-08-17-11'14'39.loc\n" + "3 13.0 137.893 266.667 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L3_13kV_2016-08-17-11'14'39.loc\n" + "1 13.0 139.673 238.095 C:\\Users\\z2066\\Documents\\Munka\\Diagnosztika\\KD 2016\\OWTS\\Gyor regio\\Sopron\\Frankenburg BHTR-Kossuth KTW\\L1_13kV_2016-08-17-11'05'50.loc\n" + "Joints:\n" + "0\n" + "266\n"; 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