Re: Regex help-hilfe-ajuto needed
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On Sat, 17 Aug 2002, at 18:25:20 -0700 Januk wrote in
[EMAIL PROTECTED]">mid:[EMAIL PROTECTED] :
JA On Saturday, August 17, 2002 at 21:35 GMT +0200, a stampede was
JA started when Mandara hollered:
Well, that's something... ;-)
JA I know this should really go on TBTECH, but I suppose one or two of
JA these every couple of years on TBUDL isn't so bad.
.
Januk, thanks a lot for the all useful things you wrote. I'll proceed
with it on tbtech, as you and Luc suggested.
Mandara
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Regex help-hilfe-ajuto needed
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Hello,
I need just one simple thing: extract a defined *single line* from
message header and put it in body of reply.
But no matter how is that simple, I couldn't do that.
This one ^From: (.*)?$ extracts to much and doesn't stop at the
end of line (includes entire header from the from line downward).
This one ^From: (.*?)\.\w+\s* extracts only till dot in address
domain name (e.g Name username@ispname).
Is there some elegant formula which would take only one line you
chose by the first word in the line?
Be patient with me, please, I am very beginner, and already infected
with regexp (last night downloaded Gerd's tutorial and forgot to go
to sleep).
Mandara
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Re: Regex help-hilfe-ajuto needed
Hello Mandara, On Saturday, August 17, 2002 at 9:35:24 PM you [M] wrote (at least in part): M Is there some elegant formula which would take only one line you M chose by the first word in the line? You nearly got it: ^From:\s*(.*?)\n You see the difference? The question mark is _inside_ the parentheses and it searches for the 'newline' explicitly. This should work quite fine and have everything after 'From:' followed by any number of white spaces but before 'new line' in sub pattern 1. -- Regards Peter Palmreuther (The Bat! v1.61 on Windows 2000 5.0 Build 2195 Service Pack 1) Borrow money from pessimists--they don't expect it back. Current version is 1.61 | Using TBUDL information: http://www.silverstones.com/thebat/TBUDLInfo.html
Re: Regex help-hilfe-ajuto needed
Hello Mandara, On Saturday, August 17, 2002 at 21:35 GMT +0200, a stampede was started when Mandara hollered: I know this should really go on TBTECH, but I suppose one or two of these every couple of years on TBUDL isn't so bad. This one ^From: (.*)?$ extracts to much and doesn't stop at the end of line (includes entire header from the from line downward). As Peter mentioned, you need to put the question mark inside the brackets. The reason is that the way you've written it, the expression says: Look for zero or one occurrence of any number of any character after a a line starting with From: . This means you have a redundancy in your repetition operators. What you wanted instead is: Look for the fewest number of anything on one line that starts with From: . To do that you need to make the any number operator (*) ungreedy. That is done by adding a question mark *immediately* after the repeat operator. So, .* matches the most number of any characters it can, while .*? matches the fewest number of any characters that it can. So a corrected version of your expression would be: ^From: (.*?)$ Of course, there are three stylistic things that I would change about the above. First, I usually add the ignore case option, just to be more general. Second, I usually use \s* instead of a literal space to find whitespace. This makes sure that I trim *all* spaces if there is more than one space and it removes other white space characters like tabs. Note, these suggestions make the expression more general, so there can be some undesired behaviour. In my experience, the undesired cases for these two suggestions are so rare that they are well worth the risk. The third suggestion is to explicitly set the multi-line mode. This prevents problems if the default settings ever get changed for any reason. It also makes it very clear what behaviour you want from TB. After all, the help file suggests that you actually are in the *opposite* mode by default, so your expression (and Peter's) would fail if From: wasn't the very first header. So the final corrected version that I would use would be: (?im-s)^From:\s*(.*?)$ Note I also unset the Dot All option. I'll let you read the help file (or the tutorial) to find out why. Be patient with me, please, I am very beginner, and already infected with regexp (last night downloaded Gerd's tutorial and forgot to go to sleep). I highly recommend that you subscribe to the TBTECH list. That list was specially designed for detailed technical discussions. It has become more or less specialized towards regexps. While Gerd's tutorial is very well written, it won't really sink in until you try analyzing some of the many expressions written on these lists. You should try it, post your results on TBTECH and you'll get some good feedback. -- Thanks for writing, Januk Aggarwal Ok, who is General Relativity, and what did he do with Sir Newton? Current version is 1.61 | Using TBUDL information: http://www.silverstones.com/thebat/TBUDLInfo.html
Re: Regex help-hilfe-ajuto needed
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On Sat, 17 Aug 2002, at 22:01:02 +0200 Peter wrote:
PP ^From:\s*(.*?)\n
PP You see the difference? The question mark is _inside_ the parentheses
PP and it searches for the 'newline' explicitly.
Yep, I got it. I glued myself with $ as only metachar for the end of
the line. ;-)
PP This should work quite fine and have everything after 'From:' followed
PP by any number of white spaces but before 'new line' in sub pattern 1.
Works like baby. Thanks!
Mandara
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