Re: search and replace using regex

[drieux]

On Dec 3, 2003, at 12:25 PM, Saskia van der Elst wrote:

I have trouble executing a search and replace through all files in a 
certain
directory.

I want to replace " _</pat" by "</pat"

Can I match a white-space?

I have tried the following regex:

s/ _\</pat/"</pat"/g
[..]

I agree with Tom that you get better
mileage by putting your delimiters to
something OTHER than a token in the
pattern that you are matching.
but there is also the little detail
of putting that "\" in the right place.
	$_ =~ s/"_\</pat"/"\</pat"/gi; #g for every occurrence, i for

should ahve been

	$_ =~ s/_<\/pat/<\/pat/gi; #g for every occurrence, i for

target what you WANT to target and no more.

remember that those double quotes will allow things
to be 'interpolated' - which is not what you want.
but also if you had adopted Tom's strategy that line
would be a bit more readable as:
	$_ =~ s|_</pat|</pat|gi; #g for every occurrence, i for

If you wanted to merely remove the "_" that preceded
an angle that closed you could tighten that down with
	$_ =~ s|_</|</|gi; #g for every occurrence, i for

you did I think mention perldoc perlre, yes?

you might also want to check out

        perldoc perlrequick
        perldoc perlretut
but some of it is merely 'art' and not science...

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