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

/
/
gx

Test String

Code Generator

Language

Generated Code

$re = '/\b(?<![\$\&\+\_\--\/\<\>\?])(?:(?:(?:4\d|5[1-5]|65)(\d\d)(?!\1{3})|35(?:2[89]|[3-8]\d)|6(?:011|4[4-9]\d|22(?:1(?!1\d|2[1-5])|[2-8]|9(?=1\d|2[1-5]))))([\ \-]?)(?<!\d\ \d{4}\ )(?!(\d)\3{3})(\d{4})\2(?!\4|(\d)\5{3}|1234|2345|3456|5678|7890)(\d{4})(?!\ \d{4}\ \d)\2(?!\6|(\d)\7{3}|1234|3456)|3[47]\d{2}([\ \-]?)(?<!\d\ \d{4}\ )(?!(\d)\9{5}|123456|234567|345678)\d{6}(?!\ \d{5}\ \d)\8(?!(\d)\10{4}|12345|56789|67890)\d|(?:(?:5[0678]|6[27])\d\d|6304|6390)\d{11}(?!(\d)\11{3}))\d{4}(?![\$\&\+\_\-\/\<\>])(?![\.\?]\d)\b/x'; $str = '4111111111111111 4111 1111 1111 1111 4111-1111-1111-1111 4111-1111 1111-1111 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 American Express 378282246310005 American Express 371449635398431 American Express Corporate 378734493671000 Australian BankCard 5610591081018250 Diners Club 30569309025904 Diners Club 38520000023237 Discover 6011111111111117 Discover 6011000990139424 JCB 3530111333300000 JCB 3566002020360505 MasterCard 5555555555554444 MasterCard 5105105105105100 Visa 4111111111111111 Visa 4012888888881881 Visa 4222222222222 Note : Even though this number has a different character count than the other test numbers, it is the correct and functional number. Processor-specific Cards Dankort (PBS) 76009244561 Dankort (PBS) 5019717010103742 Switch/Solo (Paymentech) 6331101999990016 Visa 4929208147724685 4539261278252432 4916790209546242 4556229836495866 4556624948936262 Mastercard 5527513721190671 5427136938547169 5501820872619287 5106667846492187 5348965176175440 Discover 6011692621234093 6011505674384294 6011686367026051 6011805238158246 6011056229327552 American Express 370831029267044 345838860105292 346823285239073 370750517718351 340533441239380 PHONE NUMBERS: Local (Canada) 613-555-0104 613-555-0141 613-555-0159 613-555-0130 613-555-0163 613-555-0137 International (Canada) +1-613-555-0104 +1-613-555-0141 +1-613-555-0159 +1-613-555-0130 +1-613-555-0163 +1-613-555-0137'; preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0); // Print the entire match result var_dump($matches);

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