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
Processing...

Test String

Code Generator

Language

Generated Code

re = /[^\r\n\t\f]*error/ str = 'src/client/application/shared/modals/settings/settings-model.ts(79,21): error TS2403: Subsequent variable declarations must have the same type. Variable \'obj\' must be of type \'ISettingsValue\', but here has type \'any\'. src/client/application/shared/modals/settings/settings-model.ts(86,25): error TS2339: Property \'values\' does not exist on type \'ISettingsValue\'. src/client/application/shared/modals/settings/settings-model.ts(87,25): error TS2339: Property \'values\' does not exist on type \'ISettingsValue\'. src/client/application/shared/modals/settings/settings-model.ts(152,24): error TS7006: Parameter \'value\' implicitly has an \'any\' type. src/client/application/ui-cdv/dashboard/adsa.ts(6,19): error TS2304: Cannot find name \'html\'. src/client/application/ui-cdv/dashboard/adsa.ts(10,1): error TS1148: Cannot compile modules unless the \'--module\' flag is provided.' # Print the match result str.scan(re) do |match| puts match.to_s end

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 Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html