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 = /((\d{1,2}:)?[0-5]?\d:[0-5]?\d)((\s|\'|\||-|,|(PM|AM))*)(((3[01]|[12][0-9]|0[1-9]|[1-9])|([0-9]{4}))(\/|\-|\|)(1[0-2]|0[1-9]|[1-9])(\/|\-)([0-9]{4}|(3[01]|[12][0-9]|0[1-9]))?)|((((3[01]|[12][0-9]|0[1-9]|[1-9])|([0-9]{4}))(\/|\-|\|)(1[0-2]|0[1-9]|[1-9]|\w{3})(\/|\-)([0-9]{1,4}|(3[01]|[12][0-9]|0[1-9])))(((\s|\'|\||-|,)*)((\d{1,2}:)?[0-5]?\d:[0-5]?\d))?)/g; // Alternative syntax using RegExp constructor // const regex = new RegExp('((\\d{1,2}:)?[0-5]?\\d:[0-5]?\\d)((\\s|\\\'|\\||-|,|(PM|AM))*)(((3[01]|[12][0-9]|0[1-9]|[1-9])|([0-9]{4}))(\\\/|\\-|\\|)(1[0-2]|0[1-9]|[1-9])(\\\/|\\-)([0-9]{4}|(3[01]|[12][0-9]|0[1-9]))?)|((((3[01]|[12][0-9]|0[1-9]|[1-9])|([0-9]{4}))(\\\/|\\-|\\|)(1[0-2]|0[1-9]|[1-9]|\\w{3})(\\\/|\\-)([0-9]{1,4}|(3[01]|[12][0-9]|0[1-9])))(((\\s|\\\'|\\||-|,)*)((\\d{1,2}:)?[0-5]?\\d:[0-5]?\\d))?)', 'g') const str = `6/4/16 Lorem ipsum 00:00 09/04/2020 Lorem ipsum 20:20 01/07/2019 Lorem ipsum 00:00:00 01/07/1000 Lorem ipsum 01:00:00 01/07/1000 Lorem ipsum 19:57' 6/4/2020 Lorem ipsum 10:18, 09/04/2020 Lorem ipsum 15:39 | 08/04/2020 Lorem ipsum Lorem ipsum00:15:39 | 31/04/2020 Lorem ipsum Lorem ipsum 8:17 5/4/2020 Lorem ipsum Lorem ipsum | 09:59:00 09/04/2020 Lorem ipsum 20:38 PM 08/04/2020 Lorem ipsum Lorem ipsum 00:00 09/04/2020 00:00 09/04/2020 Lorem ipsum Lorem ipsum 00:00 09/04/2020 Lorem ipsum 20:00 09/04/2020 Lorem ipsum 20:00 09/04/2020 20:00 09/04/2020 Lorem ipsum Lorem ipsum 20:00 09/04/2020 Lorem ipsum 00:00 09-04-2020 Lorem ipsum 00:00 09-04-2020 00:00 09-04-2020 Lorem ipsum Lorem ipsum 00:00 09-04-2020 Lorem ipsum 00:34 | 23/03/1984 Lorem ipsum 00:34 | 23/03/1984 00:34 | 23/03/1984 Lorem ipsum Lorem ipsum 00:34 | 23/03/1984 Lorem ipsum 00:34 | 23-03-1984 Lorem ipsum 00:34 | 23-03-1984 00:34 | 23-03-1984 Lorem ipsum Lorem ipsum 00:34 | 23-03-1984 Lorem ipsum 00:34 - 23-03-1984 Lorem ipsum 00:34 - 23-03-1984 00:34 - 23-03-1984 Lorem ipsum Lorem ipsum 00:34 - 23-03-1984 Lorem ipsum Lorem ipsum 00:34 - 23/03/1984 00:34 - 23/03/1984 Lorem ipsum Lorem ipsum 00:34 - 23/03/1984 Lorem ipsum Lorem ipsum 2020-04-20 00:00 Lorem ipsum Lorem ipsum 23/03/1984 | 00:34 Lorem ipsum Lorem ipsum 09/04/2020 00:00 Lorem ipsum Lorem ipsum8/4/2020, 16:30Lorem ipsum Lorem ipsum 08/4/2020, 16:30:00 Lorem ipsum Lorem ipsum 06/02/2020 Lorem ipsum Lorem ipsum 2014-04-01 12:00:00 Lorem ipsum Lorem ipsum 09/04/2020 09:50 Lorem ipsum Lorem ipsum 09/04/2020, 10:06 Lorem ipsum Lorem ipsum, 09/04/2020 11:24 GMT +7 Lorem ipsum09/04/2020 9:50 Lorem ipsum Lorem ipsum, 8/4/2020, 16:30 Lorem ipsum2014-mar-01 12:00:00 Lorem ipsum Lorem ipsum 2020/08/08 | 12:12:33 Lorem ipsum 2020/08/08 ,12:12:33 Lorem ipsum 2020/08/08,12:12:33 Lorem ipsum 2020/08/08, 12:12:332324123 Lorem ipsum Lorem ipsum 08/08/2020 15:31 Lorem ipsum Lorem ipsum 17/01-2020 15:31 Lorem ipsum Lorem ipsum 9/4/2020 - 12:07Lorem ipsum Lorem ipsum 07/04/2020 - 08:11 Lorem ipsum Lorem ipsum 09/04/2020 13:00 Lorem ipsum Lorem ipsum 09/04/2020 13: Lorem ipsum Lorem ipsum, 8/4/2020 22:53'(GMT+7) 6/4/16 Lorem ipsum 00:00 09/04/2020 Lorem ipsum 20:20 01/07/2019 Lorem ipsum 00:00:00 01/07/1000 Lorem ipsum 01:00:00 01/07/1000 Lorem ipsum 19:57' 6/4/2020 Lorem ipsum 10:18, 09/04/2020 Lorem ipsum 15:39 | 08/04/2020 Lorem ipsum Lorem ipsum00:15:39 | 31/04/2020 Lorem ipsum Lorem ipsum 8:17 5/4/2020 Lorem ipsum Lorem ipsum | 09:59:00 09/04/2020 Lorem ipsum 20:38 PM 08/04/2020 Lorem ipsum Lorem ipsum 00:00 09/04/2020 lorem 00:00 09/04/2020 Lorem ipsum Lorem ipsum 00:00 09/04/2020 Lorem ipsum 20:00 09/04/2020 Lorem ipsum 20:00 09/04/2020 20:00 09/04/2020 Lorem ipsumLorem ipsum 20:00 09/04/2020 Lorem ipsum 00:00 09-04-2020 Lorem ipsum 00:00 09-04-2020 00:00 09-04-2020 Lorem ipsum Lorem ipsum 00:00 09-04-2020 Lorem ipsum 00:34 | 23/03/1984 Lorem ipsum 00:34 | 23/03/1984 00:34 | 23/03/1984 Lorem ipsum Lorem ipsum 00:34 | 23/03/1984 Lorem ipsum 00:34 | 23-03-1984 Lorem ipsum 00:34 | 23-03-1984 00:34 | 23-03-1984 Lorem ipsum Lorem ipsum 00:34 | 23-03-1984 Lorem ipsum00:34 - 23-03-1918Lorem ipsum 00:34 - 23-03-198400:34 - 23-03-1984 Lorem ipsum Lorem ipsum 00:34 - 23-03-1984 Lorem ipsumLorem ipsum 00:34 - 23/03/1984Lorem 00:34 - 23/03/1984 Lorem ipsum Lorem ipsum 00:34 - 23/03/1984 Lorem ipsum Lorem ipsum 2020-04-20 00:00 Lorem ipsum Lorem ipsum 23/03/1984 | 00:34 Lorem ipsum Lorem ipsum 09/04/2020 00:00 Lorem ipsum Lorem ipsum8/4/2020, 16:30Lorem ipsum Lorem ipsum 08/4/2020, 16:30:00 Lorem ipsum Lorem ipsum 06/02/2020 Lorem ipsum Lorem ipsum 2014-04-01 12:00:00 Lorem ipsum Lorem ipsum 09/04/2020 09:50 Lorem ipsum Lorem ipsum 09/04/2020, 10:06 Lorem ipsum Lorem ipsum, 09/04/2020 11:24 GMT +7 Lorem ipsum09/04/2020 9:50 Lorem ipsum Lorem ipsum, 8/4/2020, 16:30 Lorem ipsum2014-mar-01 12:00:00 Lorem ipsum Lorem ipsum 2020/08/08 | 12:12:33 Lorem ipsum 2020/08/08 ,12:12:33 Lorem ipsum 2020/08/08,12:12:33Lorem ipsum 2020/08/08, 12:12:332324123 Lorem ipsum Lorem ipsum 08/08/2020 15:31 Lorem ipsum Lorem ipsum 17/01-2020 15:31 Lorem ipsum Lorem ipsum 9/4/2020 - 12:07Lorem ipsum Lorem ipsum 07/04/2020 - 08:11 Lorem ipsum Lorem ipsum 09/04/2020 13:00 Lorem ipsum Lorem ipsum 09/04/2020 13: Lorem ipsum Lorem ipsum, 8/4/2020 22:53'(GMT+7) Lorem ipsum, 09/04/2020 11:24 GMT +7 // mising GMT 09 tháng 04 năm 2020 09:11 GMT+7 // missing`; // 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