Reg. Expression - Replace " from string

dani_cv_74 has asked for the wisdom of the Perl Monks concerning the following question:

Hi All,
Can you please help me out to write this regular expression. I am sure this may be simple for you
I want to find whether the string has got a '&' sign in the begining or in the end or not.
If founds, remove this -> &. Here is the code which I am looking ahead

$str = "&ABCD"
<Regular expression should remove the & and put the ABCD to string $st
+r>
or 
$str = "ABCD&"
<same way, Regular expression should remove the & and put the ABCD to 
+string $str>
[download]

so, $str always should contains, just ABCD. Thanks and Best Regards, Dan.

Comment on Reg. Expression - Replace " from string Download Code

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Re: Reg. Expression - Replace " from string by GrandFather (Saint) on Jun 15, 2006 at 21:38 UTC
Give a fish, or teach him to fish? /me dons tutor's hat. Read the Tutorials sections here for an introduction to regexen. In particular take note of the magical characters that match the start (^) and end ($) of a string. Note also the alternation (\|) character. Also read the Perl man pages perlretut, perlrequick and perlre. DWIM is Perl's answer to Gödel	[reply]
Re: Reg. Expression - Replace " from string by albert (Monk) on Jun 15, 2006 at 23:33 UTC
I second the recommendation to check the documentation. Still to get you started, here are a few things which solve your exact questions. `# Remove first & $str =~ s/^&//; # Remove last & $str =~ s/&$//; # Remove all & $str =~ s/&//g;` [download] -a	[reply] [d/l]
Re^2: Reg. Expression - Replace " from string by GrandFather (Saint) on Jun 15, 2006 at 23:37 UTC
and to do both requested operations at once: `$str =~ s/^&\|&$//g;` [download] but that has just given him the fish and if this is homework then he gets the kudos (possibly) without learning anything. DWIM is Perl's answer to Gödel	[reply] [d/l]
Re: Reg. Expression - Replace " from string by Jasper (Chaplain) on Jun 16, 2006 at 09:04 UTC
Wow, astonishingly similar to your first post on these boards (535528). You don't learn anything by not understanding the answers, you know...	[reply]