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text substitution question pauls 03-10-2008
Posted by pauls on March 10, 2008, 8:14 pm
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 I am trying to figure-out how to eliminate any occurrences of the
following text:

</font>

in a text file.

Usually I try to do some operation on the input file $_ like this:

s/</font>//g;

But, this does not eliminate the text.


Any help appreciated!

Thanks!

P.

Posted by Riad KACED on March 10, 2008, 8:54 pm
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 Hi Paul,

You need to protect the / in /font.

Try something like : s/<\/font>//g;

That's the simple way I see in your case. If you have patterns with a
lot of slashes, It is worth to change the separator.
If for example you want to match a web address, you could write :

m/http:\/\/\w+/(\w+\/)*\w\.html/

But I prefer :

m=http://\w+/(\w+/)*\w\.html= # = as a separator, this is an example !

Hope it helps !

Riad.

Posted by Dr.Ruud on March 10, 2008, 8:57 pm
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pauls schreef:

> I am trying to figure-out how to eliminate any occurrences of the
> following text: </font> in a text file.
> Usually I try to do some operation on the input file $_ like this:
> s/</font>//g;
> But, this does not eliminate the text.

When a string contains a slash, you need to either
choose a different separator in the substitute
command, like s#</font>##g, or escape the slash,
like s/<\/font>//g. I prefer the first.

--
Affijn, Ruud

"Gewoon is een tijger."

Posted by John Bokma on March 10, 2008, 10:02 pm
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> Usually I try to do some operation on the input file $_ like this:
>
> s/</font>//g;
>
> But, this does not eliminate the text.

You probably got an error, next time *always* include the exact error.

One solution:

        s{}g;
        

--
John

http://johnbokma.com/

Posted by Jürgen Exner on March 10, 2008, 11:31 pm
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>s/</font>//g;
>But, this does not eliminate the text.
>Any help appreciated!

If you had used strict and warnings then perl would have helped you already:

        Useless use of division (/) in void context at t.pl line 2.
        Bareword "g" not allowed while "strict subs" in use at t.pl line 2.
        t.pl had compilation errors.

Now, why would perl believe there is a division in that line? Maybe because
there is a surplus slash aka division sign? I am counting 4 where there
should be only three.

Simple solution: use a different seperator for the s command, e.g.
        s+</font>++g;

And PLEASE enable strictures and warnings.

jue

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