Re: Construct a REGEX by selected substitution

Have a look at perlre which helps me all the time!
Especially the part Extended Patterns (which I've used here) is very interesting!

For the string you submitted the following will do

$str =~ s/(?<=\s)TXT/FOO/g ;
[download]

CHeers
LuCa

UPDATE: this one might be easier

$str =~ s/ TXT/ FOO/g ;
[download]

Comment on Re: Construct a REGEX by selected substitution Select or Download Code

Replies are listed 'Best First'.
Re^2: Construct a REGEX by selected substitution by pysome (Scribe) on Sep 29, 2007 at 08:37 UTC
How to deal if the $str is : `'<a code=" TXT"> abc =" TXT </a> <text code= TXT> efg =" TXT </text> < +input s=" TXT"> hig =" TXT</input>';` [download] Thanks,	[reply] [d/l]
Re^3: Construct a REGEX by selected substitution by GrandFather (Saint) on Sep 29, 2007 at 09:07 UTC
It looks like what you really need to do is parse some HTML and manipulate some of the elements of the parsed text. However it's not clear just what you want to be able to manipulate, particularly as the sample you've given isn't a well formed fragment of HTML - you seem to have mismatched quote characters. It doesn't help that it's not clear just which TXT instances in the sample ought to be replaced. For modest sized documents HTML::TreeParser may be the most appropriate tool for the job. Perl is environmentally friendly - it saves trees	[reply]
Re^3: Construct a REGEX by selected substitution by jeanluca (Deacon) on Sep 29, 2007 at 09:02 UTC
Did you read the perlre documentation ? It contains the answer to your question! Show us what you've tried or tell us whats unclear about the documentation! LuCa	[reply]