23 Mar
2017
23 Mar
'17
9:09 p.m.
Hello,
looking quickly at the code, I see that there is a define of 500 limit for each line
loaded from the file, probably it is what the developer considered to be enough for a
regexp. I haven't gone further checking, as I am out of the office, but I guess it
just truncates the longer lines to the limit.
So it would require a patch to extend that.
Cheers,
Daniel
March 23, 2017 9:05 AM, "Tim Balmer" <t.balmer(a)edutel.nl> wrote:
Hi,
I discovered some strange behavior from the regex module yesterday (kamailio version
4.4.5).
For example we have the phone number 0033755500381 that we try to match with the
following kamailio
code:
#!define REGEX_FF_NEG_INTERNATIONAL "6"
...
if (pcre_match_group("$rU", REGEX_FF_NEG_INTERNATIONAL))
{
# Do something
}
When the content of our regex groups file is like this:
[6]
^(\+|00)3(0690|0693|0694|0695|0697|0698|0699|36|37|4160|46|47|51160|511691|511693|511696|511891|5118
3|511896|513|516091|5160921|516093|516096|516391|516392|516393|516396|516591|516592|516593|516596|51
691|5166921|516693|516696|5191|5192|5193|5196|538|54388|543
89|546|5475|5477|548|567117|5672|5677|5679|5692|5694|5696|5698|5699|5795|5796|5797|5799|58299|584|58
0|5948|5987|5988|5989|59988|59989|620|630|631|670|706|712|725|728|774|776|8591|8592|8595|8597|8598|8
99|8620|8621|8630|8631|8640|8641|8643|8649|8650|8651|8660|
8661|8664|8670|8671|869814|906698|93)
The above if statment is not matching, although it should match according to any regex
validator
(for example https://regex101.com )
But when I split the above regex in smaller parts, like this:
[6]
^(\+|00)306(90|93|94|95|97|98|99)
^(\+|00)336
^(\+|00)337
^(\+|00)34160
^(\+|00)346
^(\+|00)347
^(\+|00)351(160|1691|1693|1696|1891|1893|1896|3|6091|60921|6093|6096|6391|6392|6393|6396|6591|6592|6
93|6596|6691|66921|6693|6696|91|92|93|96)
^(\+|00)3538
^(\+|00)354(388|389|6|75|77|8)
^(\+|00)356(7117|72|77|79|92|94|96|98|99)
^(\+|00)357(95|96|97|99)
^(\+|00)358(299|4|50)
^(\+|00)359(48|87|88|89|988|989)
^(\+|00)3620
^(\+|00)363(0|1)
^(\+|00)3670
^(\+|00)3706
^(\+|00)3712
^(\+|00)372(5|8)
^(\+|00)377(4|6)
^(\+|00)385(91|92|95|97|98|99)
^(\+|00)386(20|21|30|31|40|41|43|49|50|51|60|61|64|70|71|9814)
^(\+|00)3906698
^(\+|00)393
Then the exact same regex module call as before does result in a match as expected.
So to me it looks like the regex module is having trouble with large regex expressions, I
did check
the logs but there is nothing strange there, that means also the large expression is
correctly
loaded according to the logs while in fact it is not working. Checked the regex module
documentation but there I cannot find any limits regarding to the size of invididual
expressions.
Is it me missing something or did I discover a bug in de regex module?
Best Regards,
Tim Balmer
Edutel BV
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