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=="; $result = preg_replace($re, $subst, $str); echo "The result of the substitution is ".$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 PHP, please visit: http://php.net/manual/en/ref.pcre.php