Regular Expressions 101

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%
modules/(.+)/controllers
%
iu
modules/ matches the characters modules/ literally (case insensitive)
1st Capturing Group
(.+)
.
matches any character, including unicode (except for line terminators)
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
/controllers matches the characters /controllers literally (case insensitive)
Global pattern flags
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
u modifier: unicode. Pattern strings are treated as UTF-16. Also causes escape sequences to match unicode characters
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

%
%
iu

Test String