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 = /(GSTIN No:-): (.*?\d\s)/m str = 'TAX INVOICE CA MANIN DER SINGH AND ASSOCIATES 253 B 1/12 APSARA ARCADE PUSA ROAD.NEW DELHl-110005 GSTIN No 07APAFD8365H1Z9 Bill to Place of Supply INVOICE No Dated RK Electrical Works RK Electrical Works A-240 Palam Vihar, Delhi GSTIN No:-07BBUPS5612K1Z9 Description of Services Professional Services for Month of July Total Less Discount Taxable Value ADDCGST9% ADDSGST9% Total Amount Chargeable (in words) Rupees One Lac Eighteen Thousand Only Company\'s PAN: AAKFD6723D Note-Please make cheques in favor of "CA Maninder Singh and Associates" A-240 Palam Vihar, Delhi MSA-Tl-02 1-Jul-17 SAC CODE Amount 9982 100000 100000 0 100000 9% 9000 9% 9000 118000.00 For CA Maninder Singh & Associates Authorised Signatory ()-' subst = '$1,$2 in $3:' 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