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

Substitution

Processing...

Code Generator

Language

Generated Code

const regex = /pam\.username%([A-Za-z0-9]+)@|\s\(([0-9]+)\)/gm; // Alternative syntax using RegExp constructor // const regex = new RegExp('pam\\.username%([A-Za-z0-9]+)@|\\s\\(([0-9]+)\\)', 'gm') const str = `Sep 11 03:02:00 (1568505720.145620) danted[10402]: info: pass(2): tcp/connect -: pam.username%MyUsername@46.111.111.250.48198 123.12.12.112.1080 -> 123.12.12.112.48198 111.123.123.147.443 (319721) Sep 11 03:02:00 (1568505720.147471) danted[10402]: info: pass(2): tcp/connect -: pam.username%MyUsername@46.111.111.250.37449 123.12.12.112.1080 -> 123.12.12.112.37449 123.123.123.211.443 (312) Sep 11 03:02:00 (1568505720.148240) danted[10402]: info: pass(2): tcp/connect -: 111.123.123.147.443 123.12.12.112.48198 -> 123.12.12.112.1080 pam.username%MyUsername@46.111.111.250.48198 (723) Sep 11 03:02:00 (1568505720.154784) danted[10402]: info: pass(2): tcp/connect -: 123.123.123.211.443 123.12.12.112.37449 -> 123.12.12.112.1080 pam.username%MyUsername@46.111.111.250.37449 (8831)`; const subst = ``; // The substituted value will be contained in the result variable const result = str.replace(regex, subst); console.log('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 JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions