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Problem with regexmatch output

 
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Superfraggle



Joined: 02 Nov 2004
Posts: 773
Location: London, UK
PostPosted: Fri Jun 15, 2007 7:57 am    Post subject: Problem with regexmatch output Reply with quote
I have a problem with my regular expression, I am new to the whole regex thing, but I must of read at least 3 tutorials now, and think I understand the principles.

However I am getting completely thrown by what is happening here. Could someone please attempt to explain this to me.

Code:

ref:="1-1139732532"
regexmatch(ref,"(1-\d{9,10})",ref)


Will produce a match (as it should)
and set the following vars

    ref[12 of 63]: 1-1139732532
    ref1[12 of 63]: 1-1139732532


So far so good, however

Code:

ref:="5641-1139732532"
regexmatch(ref,"(1-\d{9,10})",ref)


No difference there except there are a few numbers in front of the original number.

We still get a match Smile so the regex is able to correctly identify the pattern.
However now the outputted vars are
    ref[12 of 63]: 1-1139732532
    ref1[12 of 63]: 39732532


Notice the second var has changed, why is this?

It is my understanding that the second var (ref1) should be the first pattern match, which seeing as the whole thing is in brackets should be the whole thing.

Strangly enough as well if i had one extra number I lose one number of the start of ref1 add 2 i lose 2 so the following pattern emerges.


    original=1-1139732532 >>>>>>ref1=1-1139732532
    original=11-1139732532>>>>>>ref1=-1139732532
    original=111-1139732532 >>>>>>ref1=1139732532
    original=1111-1139732532>>>>>>ref1=139732532
    original=11111-1139732532>>>>>>ref1=39732532


This carries on until we reach

1111111111111-1139732532 which makes ref1 return nothing

After this point however, add as many more numbers and/or letters to the beginning as you want but ref1 will always produce the same as ref.


I hope that explains it enough, now can someone please explain that to me.
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Steve F AKA Superfraggle

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YMP



Joined: 23 Dec 2006
Posts: 265
Location: Russia
PostPosted: Fri Jun 15, 2007 10:40 am    Post subject: Reply with quote
This seems to work normally. I changed the name of the output var to make it different from the input.
Code:

ref:="5641-1139732532"
regexmatch(ref,"(1-\d{9,10})", res)
Msgbox, res=%res%`nres1=%res1%
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Superfraggle



Joined: 02 Nov 2004
Posts: 773
Location: London, UK
PostPosted: Fri Jun 15, 2007 10:50 am    Post subject: Reply with quote
Ok so it doesn't like the input and output var being the same name. Strange how some of it works and others don't.

So is this a bug, or should input and output never be the same?

I couldn't see this in the documentation, although I keep missing things like that.
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PhiLho



Joined: 27 Dec 2005
Posts: 6721
Location: France (near Paris)
PostPosted: Fri Jun 15, 2007 11:04 am    Post subject: Reply with quote
It baffles me as well, so I revived my old PCRE wrapper script and tested the expression against PCRE 6.4. Here, both the global capture and the first one are identical.
So it looks like a real bug, hopefully in AHK, not in PCRE...
Unless Chris has a better explanation.
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vPhiLho := RegExReplace("Philippe Lhoste", "^(\w{3})\w*\s+\b(\w{3})\w*$", "$1$2")
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Titan



Joined: 11 Aug 2004
Posts: 5026
Location: imaginationland
PostPosted: Fri Jun 15, 2007 12:01 pm    Post subject: Reply with quote
I suspect it's a bug with the way AutoHotkey parses the result, because extracting them yourself in position and length mode works:

Code:
seq = 5641-1139732532
matchPos := RegExMatch(seq, "P)(1-\d{9,10})", match)
StringMid, ref, seq, matchPos, match
StringMid, ref1, seq, matchPos1, matchLen1
MsgBox, %ref%`n%ref1%

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RegExReplace("irc.freenode.net/autohotkey", "^(?=(.(?=[\0-r\[]*((?<=\.).))))(?:[c-\x73]{2,8}(\S))+((2)|\b[^\2-]){2}\D++$", "$u3$1$3$4$2")
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PhiLho



Joined: 27 Dec 2005
Posts: 6721
Location: France (near Paris)
PostPosted: Fri Jun 15, 2007 1:40 pm    Post subject: Reply with quote
YMP wrote:
I changed the name of the output var to make it different from the input.
Oh, I totally missed this one... So it might be an AHK bug in handling variables (overwriting?).
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vPhiLho := RegExReplace("Philippe Lhoste", "^(\w{3})\w*\s+\b(\w{3})\w*$", "$1$2")
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Chris
Site Admin


Joined: 02 Mar 2004
Posts: 10467
PostPosted: Wed Nov 21, 2007 2:54 pm    Post subject: Reply with quote
This issue has hopefully been fixed in today's v1.0.47.05. Thanks for reporting it.
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