regex doesn't work: my error or bug?

[zandar]

Hi Gintaras,
this regex (PCRE flavour) finds the substring between two single quotes:

Code:

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(?<=')(.*?)(?=')

It works well when tested in RegexBuddy 4, 

in https://regexr.com and https://www.regexpal.com:

 

but if fails in QM:

Code:

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str userNamePattern username risultato
username="WHERE nomepass = 'testname'"
userNamePattern = "(?<=')(.*?)(?=')"
if(findrx(username userNamePattern 0 0 risultato 2)>=0)
    out risultato
else
    mes "match for ''(?<=')(.*?)(?=')'' not found" "Error"

is it my fault?

Again thank you for your exceptional support.

[Gintaras]

It seems it is a bug or feature in the (older) library PCRE version that QM uses. I tested with current PCRE version and it works well.
Workaround 1: use + instead of *
Workaround 2: don't use (?<=')

Also, in you code the submatch argument is 2. Must be 0 or 1.

Macro Macro2980

Code:

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str userNamePattern username risultato
username="= 'testname'"
userNamePattern = "'(.*?)'"
int i=findrx(username userNamePattern 0 0 risultato 1)
out i
out risultato

[zandar]

Ok, i got it.

Thanks again