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 = "^[A-Z-0-9]+ .*(?<type>chore|ci|docs|feat|fix|perf|refactor|revert|style|test|¯\\\\_\\(ツ\\)_\\/¯)(?<scope>\\(\\w+\\)?((?=:\\s)|(?=!:\\s)))?(?<breaking>!)?(?<subject>:\\s.*)?|^(?<merge>Merge.* \\w+)|^(?<revert>Revert.* \\w+)"; final String string = "### Should Pass Test\n\n" + "NV-1234 chore: change build progress\n" + "DT-123456 docs: update xdemo usage\n" + "QA-123 ci: update jenkins automatic backup\n" + "CC-1234 feat: new fucntional about sync\n" + "Merge branch master into develop\n" + "Reverted: Revert \"support UV113 feature & bugfix branches make full build\n" + "Merge pull request #36 in cicd from test to developSquashed commit of the following: com\n\n" + "### Failed to match test\n" + "NV-1234 build: update \n" + "NV-1234 Chore: change progress\n" + "DT-123456 Docs: update xdemo\n" + "QA-123ci: update jenkins automatic backup\n" + "CC-1234 Feat: new fucntional about sync\n" + "DT-17734: 8.2.2 merge from CF1/2- Enhance PORT.STATUS to identify Python processes initiated\n" + "DT-17636 fix AIX cord dump issue\n" + "DT-18183 Fix the UDTHOME problem for secure telnet\n" + "DT-18183 Add new condition to get UDTHOME\n" + "DT-15567 code merge by Peter Shen."; 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