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

/
/
sxg

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

const regex = /(?: ([^";\r\n]*) #1 value without quotes or | \x20* ("(?:[^"]+|"")*") \x20* #2 value inside quotes ) (?: (;) #3 values delimiter or | [\r\n]+ # rows delimiter )/sg; // Alternative syntax using RegExp constructor // const regex = new RegExp('(?: ([^";\\r\\n]*) #1 value without quotes or | \\x20* ("(?:[^"]+|"")*") \\x20* #2 value inside quotes ) (?: (;) #3 values delimiter or | [\\r\\n]+ # rows delimiter )', 'sg') const str = `501 ; 8300000000000 ; ";Автономный ;"";округ"" ""Ненецкий"";";test1 751;8600800000000; " Автономный округ ""Ханты-Мансийский"", Район Советский" ; 1755;8700300000000;Автономный округ Чукотский, Район Билибинский 1725;7501900000000;Край Забайкальский, Район Петровск-Забайкальский ;; 711;2302100000000;Край Краснодарский, Район Лабинский 729;2401600000000;Край Красноярский, Район Иланский 765;2700700000000;Край Хабаровский, Район Вяземский`; const subst = `\1\2\x01\3\x02`; // 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