egghelp/eggheads community

brackets

2003-05-16T09:11:17-04:00

oops.. never mind

Statistics: Posted by Papillon — Fri May 16, 2003 9:11 am

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2003-05-16T07:02:40-04:00

Wanted to count how many { and } are in a file and compare them in the end.

Statistics: Posted by caesar — Fri May 16, 2003 7:02 am

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2003-05-16T06:53:48-04:00

I asked what you're using it for since you might have an interest in NOT matching escaped braces in your file.

As for your question...what do you mean?
I'll answer what i think your question was about...if you wanted to match "{0" the { would have to be double escaped.

Tclsh test:
% regexp \\{0 \{0
1
% regexp \{0 \{0
couldn't compile regular expression pattern: quantifier operand invalid

Statistics: Posted by user — Fri May 16, 2003 6:53 am

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2003-05-16T06:48:16-04:00

For my personal knowlege. I want to know if I've missed one or something like this. Dosen't matter for what I've use it, stdragon gave me the best solution and all I would like to know now it's the thing I've asked a few moments ago.

Statistics: Posted by caesar — Fri May 16, 2003 6:48 am

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2003-05-16T06:45:48-04:00

Who? What?

btw: what is the purpose of counting the braces?

Statistics: Posted by user — Fri May 16, 2003 6:45 am

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2003-05-16T06:37:15-04:00

Please give me an example of the matches you've mentioned earlier. I'm asking this to understand things better not to bitch around. Thank you.

Statistics: Posted by caesar — Fri May 16, 2003 6:37 am

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2003-05-16T06:31:34-04:00

{ when followed by a character other than a digit, matches the left-brace character `{'; when followed by a digit, it is the beginning of a bound.
So double escaping it is only needed when you're looking for a { followed by a number.

Statistics: Posted by user — Fri May 16, 2003 6:31 am

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2003-05-16T05:53:43-04:00

I don't want to bitching around, but I've test the thing you've said about the \'s and actualy the regexp worked with one \ like this: \{.

Statistics: Posted by caesar — Fri May 16, 2003 5:53 am

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2003-05-15T04:09:41-04:00

Yes, you are right, as usualy. Thank you for explaining this.

Statistics: Posted by caesar — Thu May 15, 2003 4:09 am

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2003-05-14T05:29:32-04:00

There is some magic here, that you should understand.

In Tcl, you may need to escape certain characters. EG, you can use \003, \{, \[

However, what if you want to place the backslash (\) into your text, and not have it interpret it as escaping the next character. You use \\.

Tcl isn't the only language that uses escape sequences. Infact, Regular Expressions are a language in themselves, and they also have escape sequences.

So if you need to send a escape { to regexp, you can't send \{, as Tcl will capture it, and sort the \ before it makes it to regexp. Thus, using \\{ in Tcl, sends \{ to the regexp.

Statistics: Posted by ppslim — Wed May 14, 2003 5:29 am

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2003-05-14T02:34:38-04:00

Ahh.. duno why sometimes I choose the hard way on doing things. Silly me forgot about the 'regexp'.. pff. Thank you.

PS: As far as I remember don't think there is a need of two \ in front of the { and no need (humm..) of then in front of the }. Not shure 100% about this anyway. I chould be wrong or something.

Statistics: Posted by caesar — Wed May 14, 2003 2:34 am

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2003-05-13T02:41:20-04:00

Code:

set fp [open sheep/baa.txt r]set data [read $fp]close $fpset openbraces [regexp -all "\\{" $data]set closebraces [regexp -all "\\}" $data]

Statistics: Posted by stdragon — Tue May 13, 2003 2:41 am

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2003-05-13T01:18:23-04:00

I would like to read all the { and } from a file and tell the result.

Statistics: Posted by caesar — Tue May 13, 2003 1:18 am

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2003-05-12T04:07:33-04:00

I'm talking about the while loop...it'll only be executed once, so you might aswell do if {![eof]} {..}
In your foreach you loop through the list of lines created with [split [read $file] "\n"], so the ONE line of code you used for testing should still result in 1 and 1.

What exactly are you trying to do?

Statistics: Posted by user — Mon May 12, 2003 4:07 am

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2003-05-12T03:52:40-04:00

About what "looping" are you talking about? As far as I can see I'm reading all the lines of the file the split them in to pices with the foreach thing. At least this should happen. I have also tryed to split again the result to make the match more eficient but screwed it somehwere.

Statistics: Posted by caesar — Mon May 12, 2003 3:52 am