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

/
/
sg

Test String

Substitution

Processing...

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 = "BEGIN:VEVENT.*?SUMMARY:(HMIN105M|HMSN118|HMIN121M|HMIN122M).*?END:VEVENT"; final String string = "BEGIN:VCALENDAR\n" + "METHOD:PUBLISH\n" + "PRODID:-//ADE/version 6.0\n" + "VERSION:2.0\n" + "CALSCALE:GREGORIAN\n" + "BEGIN:VEVENT\n" + "DTSTAMP:20241023T155849Z\n" + "DTSTART:20241023T111500Z\n" + "DTEND:20241023T124500Z\n" + "SUMMARY:MECA-S1-CM\n" + "LOCATION:B42 - Amphi N (003)\n" + "DESCRIPTION:\\\\n\\\\nCM/TD/TP tout Cycle prépa 1\\\\nAUCHE Doriane\\\\n\\\\n(Modifié le\n" + " :31/05/2024 14:00)\n" + "UID:ADE60456d706c6f6973647574656d7073323032342d323032352d36333237302d302d\n" + " 34\n" + "CREATED:19700101T000000Z\n" + "LAST-MODIFIED:20240531T120000Z\n" + "SEQUENCE:2141269420\n" + "END:VEVENT\n" + "BEGIN:VEVENT\n" + "DTSTAMP:20241023T155849Z\n" + "DTSTART:20241025T111500Z\n" + "DTEND:20241025T124500Z\n" + "SUMMARY:TD ATO-S1 GR A\n" + "LOCATION:B41 - 003\n" + "DESCRIPTION:\\\\n\\\\nTD GR A Cycle prépa 1\\\\nCHENU Sebastien\\\\n\\\\n(Modifié le:03/\n" + " 06/2024 11:55)\n" + "UID:ADE60456d706c6f6973647574656d7073323032342d323032352d3837332d31312d30\n" + " "; final String subst = ""; final Pattern pattern = Pattern.compile(regex, Pattern.DOTALL); final Matcher matcher = pattern.matcher(string); // The substituted value will be contained in the result variable final String result = matcher.replaceAll(subst); System.out.println("Substitution result: " + result); } }

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