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

Regex Debugger

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