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

re = /(\*{3}.*?)(?:\s*\.{3}DONE=>.*)?(\*{3})$/m str = '*** HEDAL - 2021 COMPLETE - MF - 03-01-2021...DONE=> AWR 02-2021, BUI 02-2021, PQL 02-2021, NCC 02-2021, *** *** HEDAL - 2021 COMPLETE - MF - 03-01-2021...DONE=> NCC 03-2021, *** *** HEDAL - NCC? - MF - 03-01-2021 *** *** HEDAL - CSP? - MF - 03-02-2021 ...DONE=> PPSC 08-2020, *** *** HEDAL - WELL CHALI? LSPC? CSP? - MF - 03-02-2021 *** *** HEDAL - AWR? PHQ? NCC? - MF - 03-05-2021 ...DONE=> BUI 09-2020, *** *** HEDAL - 2021 COMPLETE - MF - 03-05-2021...DONE=> NWC 02-2021, BUI 02-2021, PQL 02-2021, NCC 02-2021, *** *** HEDAL - NWC? PQL? NCC? - MF - 03-05-2021 ...DONE=> BUI 12-2020, *** *** HEDAL - CHALI? NCC? - MF - 03-06-2021 *** *** HEDAL - CHL? - MF - 03-06-2021 ...DONE=> NWC 02-2021, BUI 02-2021, PQL 02-2021, NCC 02-2021, *** *** HEDAL - 2021 COMPLETE - MF - 03-08-2021...DONE=> CHALI 01-2021, NCC 01-2021, *** *** HEDAL - 2021 COMPLETE - MF - 03-02-2021...DONE=> NWC 03-2021, CHL 03-2021, BUI 03-2021, PQL 03-2021, TOBA 03-2021, *** *** HEDAL - WELL CHILD VISIT? WCC? - MF - 03-06-2021 *** *** HEDAL -ExAMING? - AZ - 03-01-2021 ...DONE=> AAC 03-2021, LAL 03-2021, MICA 03-2021, BUI 03-2021, TOBA 03-2021, ***' subst = '$1 $2' result = str.gsub(re, subst) # Print the result of the substitution puts 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 Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html