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 single character of: a, b, c or d
    [[ab][cd]]
  • 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]
  • Character class intersection
    [\w&&[^\d]]
  • 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 = "([\\u0009-\\u000A]|\\u000D|[\\u0020-\\u007E]|[\\u00A0-\\u00AC]|[\\u00AE-\\u017E]|[\\u0187-\\u0188]|\\u018F|\\u0197|[\\u01A0-\\u01A1]|[\\u01AF-\\u01B0]|\\u01B7|[\\u01CD-\\u01DC]|[\\u01DE-\\u01DF]|[\\u01E2-\\u01F0]|[\\u01F4-\\u01F5]|[\\u01F8-\\u01FF]|[\\u0212-\\u0213]|[\\u0218-\\u021B]|[\\u021E-\\u021F]|[\\u0227-\\u0233]|\\u0259|\\u0268|\\u0292|[\\u02B9-\\u02BA]|[\\u02BE-\\u02BF]|\\u02C8|\\u02CC|[\\u1E02-\\u1E03]|[\\u1E06-\\u1E07]|[\\u1E0A-\\u1E11]|[\\u1E1C-\\u1E2B]|[\\u1E2F-\\u1E37]|[\\u1E3A-\\u1E3B]|[\\u1E40-\\u1E49]|[\\u1E52-\\u1E5B]|[\\u1E5E-\\u1E63]|[\\u1E6A-\\u1E6F]|[\\u1E80-\\u1E87]|[\\u1E8C-\\u1E97]|\\u1E9E|[\\u1EA0-\\u1EF9]|\\u2019|\\u2021|\\u20AC|\\u0041\\u030B|\\u0043(\\u0300|\\u0304|\\u0306|\\u0308|\\u0315|\\u0323|\\u0326|\\u0328\\u0306)|\\u0044\\u0302|\\u0046(\\u0300|\\u0304)|\\u0047\\u0300|\\u0048(\\u0304|\\u0326|\\u0331)|\\u004A(\\u0301|\\u030C)|\\u004B(\\u0300|\\u0302|\\u0304|\\u0307|\\u0315|\\u031B|\\u0326|\\u035F\\u0048|\\u035F\\u0068)|\\u004C(\\u0302|\\u0325|\\u0325\\u0304|\\u0326)|\\u004D(\\u0300|\\u0302|\\u0306|\\u0310)|\\u004E(\\u0302|\\u0304|\\u0306|\\u0326)|\\u0050(\\u0300|\\u0304|\\u0315|\\u0323)|\\u0052(\\u0306|\\u0325|\\u0325\\u0304)|\\u0053(\\u0300|\\u0304|\\u031B\\u0304|\\u0331)|\\u0054(\\u0300|\\u0304|\\u0308|\\u0315|\\u031B)|\\u0055\\u0307|\\u005A(\\u0300|\\u0304|\\u0306|\\u0308|\\u0327)|\\u0061\\u030B|\\u0063(\\u0300|\\u0304|\\u0306|\\u0308|\\u0315|\\u0323|\\u0326|\\u0328\\u0306)|\\u0064\\u0302|\\u0066(\\u0300|\\u0304)|\\u0067\\u0300|\\u0068(\\u0304|\\u0326)|\\u006A\\u0301|\\u006B(\\u0300|\\u0302|\\u0304|\\u0307|\\u0315|\\u031B|\\u0326|\\u035F\\u0068)|\\u006C(\\u0302|\\u0325|\\u0325\\u0304|\\u0326)|\\u006D(\\u0300|\\u0302|\\u0306|\\u0310)|\\u006E(\\u0302|\\u0304|\\u0306|\\u0326)|\\u0070(\\u0300|\\u0304|\\u0315|\\u0323)|\\u0072(\\u0306|\\u0325|\\u0325\\u0304)|\\u0073(\\u0300|\\u0304|\\u031B\\u0304|\\u0331)|\\u0074(\\u0300|\\u0304|\\u0315|\\u031B)|\\u0075\\u0307|\\u007A(\\u0300|\\u0304|\\u0306|\\u0308|\\u0327)|\\u00C7\\u0306|\\u00DB\\u0304|\\u00E7\\u0306|\\u00FB\\u0304|\\u00FF\\u0301|\\u010C(\\u0315|\\u0323)|\\u010D(\\u0315|\\u0323)|\\u012A\\u0301|\\u012B\\u0301|\\u017D(\\u0326|\\u0327)|\\u017E(\\u0326|\\u0327)|\\u1E32\\u0304|\\u1E33\\u0304|\\u1E62\\u0304|\\u1E63\\u0304|\\u1E6C\\u0304|\\u1E6D\\u0304|\\u1EA0\\u0308|\\u1EA1\\u0308|\\u1ECC\\u0308|\\u1ECD\\u0308|\\u1EE4(\\u0304|\\u0308)|\\u1EE5(\\u0304|\\u0308))"; final String string = ""; 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