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

Code Generator

Language

Generated Code

$re = '/{{flag\|[a-z|A-Z\s]+}}/m'; $str = '| 152||data-sort-value="4"|{{Increase}} 4||{{flag|Syria}}||3.462||data-sort-value="0.393"|{{increase}} 0.393||0.777||0.396||0.501||0.082||0.494||0.151||1.062 | 153||data-sort-value="-4"|{{decrease}} -4||{{flag|Tanzania}}||3.349||data-sort-value="-0.317"|{{decrease}} -0.317||0.511||1.042||0.365||0.390||0.354||0.066||0.621 | 154||data-sort-value="3"|{{Increase}} 3||{{flag|Burundi}}||2.905||data-sort-value="0.000"|{{steady}} 0.000||0.092||0.630||0.152||0.060||0.204||0.084||1.683 | 155||NA||{{flag|Central African Republic}}||2.693||NA||0.000||0.000||0.019||0.271||0.281||0.057||2.066 |{{flagicon|Kosovo}} \'\'[[Kosovo]]\'\' <ref name="KOS" group=Note>{{Kosovo-note}}</ref> |{{flagicon|Somaliland}} [[Somaliland|Somaliland region]] |{{flagicon|Palestine}} \'\'[[Palestinian Territories]]\'\'{{refn|See the following on statehood criteria:'; preg_match_all($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