Python uses its own SRE engine. But it is fully compatible with PCRE. Also I tested it with node /Javascript and that produces the same result as in python. 

It seems like the library does some internal optimization and for the misleading false is because of its detection of catastrophic backtracking. And yes, that's great! 

On Thu, Sep 22, 2016 at 3:17 PM, Brian West <brian@freeswitch.org> wrote:

What library does python use for regex?  We use libPCRE.

On Thu, Sep 22, 2016 at 12:39 PM, Podrigal, Aron <aronp@guaranteedplus.com> wrote:

Hi,

I just tried and compared regexs with python and freeswitch and the performance. I found it interesting 

1) why in freeswitch the following is false

freeswitch@internal> regex sxsssssssssssssssssssssssa|(\S+)+x

false 

2) (Probably the earlier is the answer) how does freeswitch solve this in less than a second, where in python / node it took around 23 seconds (on my machine).

Thanks.

--

Aron Podrigal

-

'1000001', '1110010', '1101111', '1101110'   '1010000', '1101111', '1100100', '1110010', '1101001', '1100111', '1100001', '1101100'

P: '2b', '31', '33', '34', '37', '34', '35', '38', '36', '30', '39', '39'

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--

Aron Podrigal

-

'1000001', '1110010', '1101111', '1101110'   '1010000', '1101111', '1100100', '1110010', '1101001', '1100111', '1100001', '1101100'

P: '2b', '31', '33', '34', '37', '34', '35', '38', '36', '30', '39', '39'

_________________________________________________________________________
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