Regular Expressions 101

Save & Share

  • Regex Version: ver. 1
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

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

/
/
g

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 = "[\\0-\\x1F\\x7F-\\x9F\\xAD\\u0378\\u0379\\u037F-\\u0383\\u038B\\u038D\\u03A2\\u0528-\\u0530\\u0557\\u0558\\u0560\\u0588\\u058B-\\u058E\\u0590\\u05C8-\\u05CF\\u05EB-\\u05EF\\u05F5-\\u0605\\u061C\\u061D\\u06DD\\u070E\\u070F\\u074B\\u074C\\u07B2-\\u07BF\\u07FB-\\u07FF\\u082E\\u082F\\u083F\\u085C\\u085D\\u085F-\\u089F\\u08A1\\u08AD-\\u08E3\\u08FF\\u0978\\u0980\\u0984\\u098D\\u098E\\u0991\\u0992\\u09A9\\u09B1\\u09B3-\\u09B5\\u09BA\\u09BB\\u09C5\\u09C6\\u09C9\\u09CA\\u09CF-\\u09D6\\u09D8-\\u09DB\\u09DE\\u09E4\\u09E5\\u09FC-\\u0A00\\u0A04\\u0A0B-\\u0A0E\\u0A11\\u0A12\\u0A29\\u0A31\\u0A34\\u0A37\\u0A3A\\u0A3B\\u0A3D\\u0A43-\\u0A46\\u0A49\\u0A4A\\u0A4E-\\u0A50\\u0A52-\\u0A58\\u0A5D\\u0A5F-\\u0A65\\u0A76-\\u0A80\\u0A84\\u0A8E\\u0A92\\u0AA9\\u0AB1\\u0AB4\\u0ABA\\u0ABB\\u0AC6\\u0ACA\\u0ACE\\u0ACF\\u0AD1-\\u0ADF\\u0AE4\\u0AE5\\u0AF2-\\u0B00\\u0B04\\u0B0D\\u0B0E\\u0B11\\u0B12\\u0B29\\u0B31\\u0B34\\u0B3A\\u0B3B\\u0B45\\u0B46\\u0B49\\u0B4A\\u0B4E-\\u0B55\\u0B58-\\u0B5B\\u0B5E\\u0B64\\u0B65\\u0B78-\\u0B81\\u0B84\\u0B8B-\\u0B8D\\u0B91\\u0B96-\\u0B98\\u0B9B\\u0B9D\\u0BA0-\\u0BA2\\u0BA5-\\u0BA7\\u0BAB-\\u0BAD\\u0BBA-\\u0BBD\\u0BC3-\\u0BC5\\u0BC9\\u0BCE\\u0BCF\\u0BD1-\\u0BD6\\u0BD8-\\u0BE5\\u0BFB-\\u0C00\\u0C04\\u0C0D\\u0C11\\u0C29\\u0C34\\u0C3A-\\u0C3C\\u0C45\\u0C49\\u0C4E-\\u0C54\\u0C57\\u0C5A-\\u0C5F\\u0C64\\u0C65\\u0C70-\\u0C77\\u0C80\\u0C81\\u0C84\\u0C8D\\u0C91\\u0CA9\\u0CB4\\u0CBA\\u0CBB\\u0CC5\\u0CC9\\u0CCE-\\u0CD4\\u0CD7-\\u0CDD\\u0CDF\\u0CE4\\u0CE5\\u0CF0\\u0CF3-\\u0D01\\u0D04\\u0D0D\\u0D11\\u0D3B\\u0D3C\\u0D45\\u0D49\\u0D4F-\\u0D56\\u0D58-\\u0D5F\\u0D64\\u0D65\\u0D76-\\u0D78\\u0D80\\u0D81\\u0D84\\u0D97-\\u0D99\\u0DB2\\u0DBC\\u0DBE\\u0DBF\\u0DC7-\\u0DC9\\u0DCB-\\u0DCE\\u0DD5\\u0DD7\\u0DE0-\\u0DF1\\u0DF5-\\u0E00\\u0E3B-\\u0E3E\\u0E5C-\\u0E80\\u0E83\\u0E85\\u0E86\\u0E89\\u0E8B\\u0E8C\\u0E8E-\\u0E93\\u0E98\\u0EA0\\u0EA4\\u0EA6\\u0EA8\\u0EA9\\u0EAC\\u0EBA\\u0EBE\\u0EBF\\u0EC5\\u0EC7\\u0ECE\\u0ECF\\u0EDA\\u0EDB\\u0EE0-\\u0EFF\\u0F48\\u0F6D-\\u0F70\\u0F98\\u0FBD\\u0FCD\\u0FDB-\\u0FFF\\u10C6\\u10C8-\\u10CC\\u10CE\\u10CF\\u1249\\u124E\\u124F\\u1257\\u1259\\u125E\\u125F\\u1289\\u128E\\u128F\\u12B1\\u12B6\\u12B7\\u12BF\\u12C1\\u12C6\\u12C7\\u12D7\\u1311\\u1316\\u1317\\u135B\\u135C\\u137D-\\u137F\\u139A-\\u139F\\u13F5-\\u13FF\\u169D-\\u169F\\u16F1-\\u16FF\\u170D\\u1715-\\u171F\\u1737-\\u173F\\u1754-\\u175F\\u176D\\u1771\\u1774-\\u177F\\u17DE\\u17DF\\u17EA-\\u17EF\\u17FA-\\u17FF\\u180F\\u181A-\\u181F\\u1878-\\u187F\\u18AB-\\u18AF\\u18F6-\\u18FF\\u191D-\\u191F\\u192C-\\u192F\\u193C-\\u193F\\u1941-\\u1943\\u196E\\u196F\\u1975-\\u197F\\u19AC-\\u19AF\\u19CA-\\u19CF\\u19DB-\\u19DD\\u1A1C\\u1A1D\\u1A5F\\u1A7D\\u1A7E\\u1A8A-\\u1A8F\\u1A9A-\\u1A9F\\u1AAE-\\u1AFF\\u1B4C-\\u1B4F\\u1B7D-\\u1B7F\\u1BF4-\\u1BFB\\u1C38-\\u1C3A\\u1C4A-\\u1C4C\\u1C80-\\u1CBF\\u1CC8-\\u1CCF\\u1CF7-\\u1CFF\\u1DE7-\\u1DFB\\u1F16\\u1F17\\u1F1E\\u1F1F\\u1F46\\u1F47\\u1F4E\\u1F4F\\u1F58\\u1F5A\\u1F5C\\u1F5E\\u1F7E\\u1F7F\\u1FB5\\u1FC5\\u1FD4\\u1FD5\\u1FDC\\u1FF0\\u1FF1\\u1FF5\\u1FFF\\u200B-\\u200F\\u202A-\\u202E\\u2060-\\u206F\\u2072\\u2073\\u208F\\u209D-\\u209F\\u20BB-\\u20CF\\u20F1-\\u20FF\\u218A-\\u218F\\u23F4-\\u23FF\\u2427-\\u243F\\u244B-\\u245F\\u2700\\u2B4D-\\u2B4F\\u2B5A-\\u2BFF\\u2C2F\\u2C5F\\u2CF4-\\u2CF8\\u2D26\\u2D28-\\u2D2C\\u2D2E\\u2D2F\\u2D68-\\u2D6E\\u2D71-\\u2D7E\\u2D97-\\u2D9F\\u2DA7\\u2DAF\\u2DB7\\u2DBF\\u2DC7\\u2DCF\\u2DD7\\u2DDF\\u2E3C-\\u2E7F\\u2E9A\\u2EF4-\\u2EFF\\u2FD6-\\u2FEF\\u2FFC-\\u2FFF\\u3040\\u3097\\u3098\\u3100-\\u3104\\u312E-\\u3130\\u318F\\u31BB-\\u31BF\\u31E4-\\u31EF\\u321F\\u32FF\\u4DB6-\\u4DBF\\u9FCD-\\u9FFF\\uA48D-\\uA48F\\uA4C7-\\uA4CF\\uA62C-\\uA63F\\uA698-\\uA69E\\uA6F8-\\uA6FF\\uA78F\\uA794-\\uA79F\\uA7AB-\\uA7F7\\uA82C-\\uA82F\\uA83A-\\uA83F\\uA878-\\uA87F\\uA8C5-\\uA8CD\\uA8DA-\\uA8DF\\uA8FC-\\uA8FF\\uA954-\\uA95E\\uA97D-\\uA97F\\uA9CE\\uA9DA-\\uA9DD\\uA9E0-\\uA9FF\\uAA37-\\uAA3F\\uAA4E\\uAA4F\\uAA5A\\uAA5B\\uAA7C-\\uAA7F\\uAAC3-\\uAADA\\uAAF7-\\uAB00\\uAB07\\uAB08\\uAB0F\\uAB10\\uAB17-\\uAB1F\\uAB27\\uAB2F-\\uABBF\\uABEE\\uABEF\\uABFA-\\uABFF\\uD7A4-\\uD7AF\\uD7C7-\\uD7CA\\uD7FC-\\uF8FF\\uFA6E\\uFA6F\\uFADA-\\uFAFF\\uFB07-\\uFB12\\uFB18-\\uFB1C\\uFB37\\uFB3D\\uFB3F\\uFB42\\uFB45\\uFBC2-\\uFBD2\\uFD40-\\uFD4F\\uFD90\\uFD91\\uFDC8-\\uFDEF\\uFDFE\\uFDFF\\uFE1A-\\uFE1F\\uFE27-\\uFE2F\\uFE53\\uFE67\\uFE6C-\\uFE6F\\uFE75\\uFEFD-\\uFF00\\uFFBF-\\uFFC1\\uFFC8\\uFFC9\\uFFD0\\uFFD1\\uFFD8\\uFFD9\\uFFDD-\\uFFDF\\uFFE7\\uFFEF-\\uFFFB\\uFFFE\\uFFFF]"; final String string = "a\n" + "asdflkn\n" + "adflkjawelkfj\n"; final Pattern pattern = Pattern.compile(regex); 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