Re: regex

There are a number of websites that have RE validators that let you see,
step by step, what the RE is matching and why.  Actually, there's a Perl
module that does that, in text mode, written by  Damian Conway.  And a
really great book is O'Reilly's Mastering Regular Expressions, by J. Friedl
https://www.oreilly.com/library/view/mastering-regular-expressions/0596528124/

probably a bootleg copy on-line somewhere.

On Mon, Jan 22, 2024 at 6:34 PM armando perez pena <[email protected]>
wrote:

> Hi,
>
> Sometimes the large path is the shortest one. Go through the tutorial in
> Perl for regular expressions and you will solve your questions and you will
> learn a lot.
>
> About regular expressions are two points of view. First one says that you
> must learn and use it.
>
> The other point of is: if you have a problem and you say I will solve it
> with regular expressions then you have two problems.
>
> Ánimos!
> Saludos
> ------------------------------
> *From:* Claude Brown via beginners <[email protected]>
> *Sent:* Monday, January 22, 2024 10:49:50 PM
> *To:* [email protected] <[email protected]>; [email protected] <
> [email protected]>
> *Subject:* RE: regex
>
> Jorge,
>
> Expanding on Karl's answer (and somewhat labouring his point) consider
> these examples:
>
> $a =~ /Jorge/
> $a =~ /^Jorge/
> $a =~ /Jorge$/
> $a =~ /^Jorge$/
>
> This shows that regex providing four different capabilities:
> - detect "Jorge" anywhere in the string
> - detect "Jorge" at the start of a string (by adding ^)
> - detect "Jorge" at the end of a string (by adding $)
> - detect that the string is exactly "Jorge" (both ^ and $)
>
> Replace "Jorge" with your pattern, and the result is the same.
>
> Cheers,
>
> Claude.
>
>
>
>
>
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>

-- 

a

Andy Bach,
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