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 = /(&CC[0-9]+:[0-9]+).*?(?=&C|$)/m str = 'T &CC3:5 Q8 Party/ Self-Identify&CC6:8 Male&CC9:11 Female&CC12:15 Q1 Vote&CC16:22 Q7 Ideology&CC23:31 Party//Ideology&CC32:33 Q9 Trump&CC34:35 Q10 Sanders&CC36:39 Q11 Polis&CC40:43 Q12 Hickenlooper&CC44:47 Q13 Gardner&CC48:50 Q14A Pres.&CC51:53 Q14B Pres.&CC54:56 Q15A Senate&CC57:59 Q15B Senate&CC60:62 Q18 Initial&CC63:66 Q29 After&CC67:69 Q19A Initial Long&CC70:72 Q20A Initial Short&CC73:76 Q28A After&CC77:79 Q19B Initial Long&CC80:82 Q20B Initial Short&CC83:86 Q28B After&CC87:89 Q21/ Banning Oil && Gas&CC90:92 Q22 Argumentation/ Ballot&CC93:95 Q23 2500 Foot/ Setback Measure&CC96:99 Q16 Protect Environment&CC100:102 Q17 Oil && Gas/ Regulation&CC103:104 Q5 Gender&CC105:108 Q6 Race&CC109:112 Q30 Education&CC113:113 White&CC114:116 Q31 Income&CC117:127 Q32 Area Breaks&CC128:134 Q4 Age&CC135:138 Men&CC139:142 Women' subst = '$1==' 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