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

/
/
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 = "\\b@[-\\w\\d.]*.[^gov\\t]+\\b"; final String string = "Love, Kenneth kenneth@teamtreehouse.com (555) 555-5555 Teacher, Treehouse @kennethlove\n" + "McFarland, Dave dave@teamtreehouse.com (555) 555-5554 Teacher, Treehouse\n" + "Arthur, King king_arthur@camelot.co.uk King, Camelot\n" + "Österberg, Sven-Erik governor@norrbotten.co.se Governor, Norrbotten @sverik\n" + ", Tim tim@killerrabbit.com Enchanter, Killer Rabbit Cave\n" + "Carson, Ryan ryan@teamtreehouse.com (555) 555-5543 CEO, Treehouse @ryancarson\n" + "Doctor, The doctor+companion@tardis.co.uk Time Lord, Gallifrey\n" + "Exampleson, Example me@example.com 555-555-5552 Example, Example Co. @example\n" + "Obama, Barack president.44@us.gov 555 555-5551 President, United States of America @potus44\n" + "Chalkley, Andrew andrew@teamtreehouse.com (555) 555-5553 Teacher, Treehouse @chalkers\n" + "Vader, Darth darth-vader@empire.gov (555) 555-4444 Sith Lord, Galactic Empire @darthvader\n" + "Fernández de la Vega Sanz, María Teresa mtfvs@spain.gov First Deputy Prime Minister, Spanish Govt.\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