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

const regex = /([0-9]+)\/([0-9]+)\/([0-9]+)|((0?[1-9]|1[0-2])-(0?[1-9]|[12]\d|3[01])-(\d{4}|\d{2}))|\w+\s\d{2},\s\d{4}|(?i)\b(Jan(?:uary|\.)?|Feb(?:ruary|\.)?|Mar(?:ch|\.)?|Apr(?:il|\.)?|May|Jun(?:e|\.)?|Jul(?:y|\.)?|Aug(?:ust|\.)?|Sep(?:tember|\.)?|Oct(?:ober|\.)?|Nov(?:ember|\.)?|Dec(?:ember|\.)?)([ ](?:0?[1-9]|[1-2][0-9]|3[01]),?[ ]|-(?:0?[1-9]|[1-2][0-9]|3[01])-)(\d{4})/g; // Alternative syntax using RegExp constructor // const regex = new RegExp('([0-9]+)\\\/([0-9]+)\\\/([0-9]+)|((0?[1-9]|1[0-2])-(0?[1-9]|[12]\\d|3[01])-(\\d{4}|\\d{2}))|\\w+\\s\\d{2},\\s\\d{4}|(?i)\\b(Jan(?:uary|\\.)?|Feb(?:ruary|\\.)?|Mar(?:ch|\\.)?|Apr(?:il|\\.)?|May|Jun(?:e|\\.)?|Jul(?:y|\\.)?|Aug(?:ust|\\.)?|Sep(?:tember|\\.)?|Oct(?:ober|\\.)?|Nov(?:ember|\\.)?|Dec(?:ember|\\.)?)([ ](?:0?[1-9]|[1-2][0-9]|3[01]),?[ ]|-(?:0?[1-9]|[1-2][0-9]|3[01])-)(\\d{4})', 'g') const str = `Mar 7, 2017 Mar. 7, 2017 March 7, 2017 3-7-2017 03-07-2017 3-7-17 03-07-17 03/7/2017 03/07/17 3/7/17 Mar-07-2017 Mar-7-2017 March-07-2017`; // Reset `lastIndex` if this regex is defined globally // regex.lastIndex = 0; let m; while ((m = regex.exec(str)) !== null) { // This is necessary to avoid infinite loops with zero-width matches if (m.index === regex.lastIndex) { regex.lastIndex++; } // The result can be accessed through the `m`-variable. m.forEach((match, groupIndex) => { console.log(`Found match, group ${groupIndex}: ${match}`); }); }

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