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

/
/
g

Test String

Code Generator

Language

Generated Code

$re = '/DEBUG[^*]*/'; $str = '* DEBUG [2015/11/25 00:06:59] /usr/local/elsa/node/elsa.pl (184) main:: 22497 [undef] Starting process_batch * DEBUG [2015/11/25 00:06:59] /usr/local/elsa/node/elsa.pl (271) main::_process_batch 22497 [undef] Offline processing: and using tempfile /data/elsa/tmp/buffers/1448438819.71967 * ERROR [2015/11/25 00:06:59] /usr/local/elsa/node/elsa.pl (295) main::_process_batch 22497 [undef] Unable to parse log line: . Only parsed into: $VAR1 = []; * DEBUG [2015/11/25 00:06:59] /usr/local/elsa/node/elsa.pl (316) main::_process_batch 22497 [undef] Finished job process_batch with 0 logs processed and 0 new programs * DEBUG [2015/11/25 00:06:59] /usr/local/elsa/node/elsa.pl (318) main::_process_batch 22497 [undef] file size for file /data/elsa/tmp/buffers/1448438819.71967 is 0 * TRACE [2015/11/25 00:06:59] /usr/local/elsa/node/elsa.pl (327) main::_process_batch 22497 [undef] No logs recorded * DEBUG [2015/11/25 00:06:59] /usr/local/elsa/node/elsa.pl (188) main:: 22497 [undef] Processed 0 records * INFO [2015/11/25 00:07:00] /usr/local/elsa/node/elsa.pl (206) main:: 22497 [undef] Exiting after processing 0 records * TRACE [2015/11/25 00:07:04] /usr/local/elsa/node/elsa.pl (135) main:: 22520 [undef] Processing file __OPS__... * DEBUG [2015/11/25 00:07:04] /usr/local/elsa/node/elsa.pl (271) main::_process_batch 22520 [undef] Offline processing: and using tempfile /data/elsa/tmp/buffers/ops_1448438824.46437 * TRACE [2015/11/25 00:07:04] /usr/local/elsa/node/elsa.pl (135) main:: 22526 [undef] Processing file __IMPORT__... * INFO [2015/11/25 00:07:04] /usr/local/elsa/node/Indexer.pm (332) Indexer::initial_validate_directory 22522 [undef] Deleting stale ops log /data/elsa/tmp/buffers/ops_1448438824.46437 * DEBUG [2015/11/25 00:07:04] /usr/local/elsa/node/Indexer.pm (364) Indexer::initial_validate_directory 22522 [undef] files: $VAR1 = [ \'/data/elsa/tmp/buffers/.\', \'/data/elsa/tmp/buffers/..\' ]; * DEBUG [2015/11/25 00:07:04] /usr/local/elsa/node/Indexer.pm (366) Indexer::initial_validate_directory 22522 [undef] considering file /data/elsa/tmp/buffers/. * DEBUG [2015/11/25 00:07:04] /usr/local/elsa/node/Indexer.pm (366) Indexer::initial_validate_directory 22522 [undef] considering file /data/elsa/tmp/buffers/.. * TRACE [2015/11/25 00:07:04] /usr/local/elsa/node/Indexer.pm (1782) Indexer::_get_lock 22522 [undef] Locked directory * DEBUG [2015/11/25 00:07:04] /usr/local/elsa/node/Indexer.pm (567) Indexer::_validate_directory 22522 [undef] Wiping via index temp_1 * TRACE [2015/11/25 00:07:04] /usr/local/elsa/node/Indexer.pm (2195) Indexer::_sphinx_index 22522 [undef] Starting Sphinx indexing for temp_1 * DEBUG [2015/11/25 00:07:04] /usr/local/elsa/node/Indexer.pm (2201) Indexer::_sphinx_index 22522 [undef] output: Sphinx 2.1.9-id64-release (rel21-r4761) Copyright (c) 2001-2014, Andrew Aksyonoff Copyright (c) 2008-2014, Sphinx Technologies Inc (http://sphinxsearch.com)'; preg_match_all($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