Regular Expressions 101

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/
(?<=\()(.*), .*, .*\d+, \d{4}(?=\))
/
gmi
Positive Lookbehind
(?<=\()
Assert that the Regex below matches
\( matches the character ( with index 4010 (2816 or 508) literally (case insensitive)
1st Capturing Group
(.*)
.
matches any character (except for line terminators)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
,
matches the characters , literally (case insensitive)
.
matches any character (except for line terminators)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
,
matches the characters , literally (case insensitive)
.
matches any character (except for line terminators)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\d
matches a digit (equivalent to [0-9])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
,
matches the characters , literally (case insensitive)
\d
matches a digit (equivalent to [0-9])
{4} matches the previous token exactly 4 times
Positive Lookahead
(?=\))
Assert that the Regex below matches
\) matches the character ) with index 4110 (2916 or 518) literally (case insensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gmi

Test String

Code Generator

Generated Code

Loading code sample...
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