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

/
/
mg

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 = "^(?::\\w*:|(?:\\ud83c[\\udf00-\\udfff])|(?:\\ud83d[\\udc00-\\ude4f\\ude80-\\udeff])|[\\u2600-\\u2B55])\\s(?<type>[a-zA-Z-,\\/]+)(?:\\((?<scope>.*)\\))?!?:\\s(?<subject>(?:(?!#).)*(?:(?!\\s).))(?:\\s\\(?(?<ticket>#\\d*)\\)?)?$"; final String string = "// Not Matched\n" + "chore(scope): test\n\n" + "hello :test: test\n\n" + ":start:test: test\n\n" + "// Matched\n\n" + ":hello: test: test\n\n" + ":start: chore(scope): test\n\n" + ":start: chore(scope): test #123\n\n" + ":memo: docs: update README.md\n\n" + ":start: chore(scope): i have a word #123\n\n\n" + ":package: feat(parser-opts): extract parser-opts packages\n\n\n" + ":sparkles: feat(changelog): 添加中文标题\n\n" + ":sparkles: feat(changelog): add chinese title\n\n" + "✨ feat(unicode): add unicode support\n\n" + "😌 test(only): add unicode support\n\n" + ":sparkles: feat: hello world (#100)\n\n" + ":green_heart: fix-ci(ci/cd): added release rules for all cz-emojis\n\n" + ":green_heart: ci/cd(config): changed config for cz-emojis\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