Hi, Rob! Amazing how quickly you coded those up!
1.a. works great.
1.b. doesn't quite work yet. The revised version (my @wanted = $string =~
/\b\w\d*\b/ig;) seems to let everything pass through it.
1.c. - Sorry I wasn't clear. I need to keep the all-numeric substrings as
well as keeping the single- and double-letter substrings. Your code kept
the double-letter ones beautifully, though.
Does the output have to go to an array? I can just reassemble it to a
single string (either delimited by colons or single blanks) as you showed,
but wondered if it can be skipped for greater efficiency.
Thanks,
Scott
Scott E. Robinson
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"Rob Dixon"
<[EMAIL PROTECTED] To: [EMAIL PROTECTED]
.co.uk> cc:
Subject: Re: Searching for the right
regular expressions
03/24/03 10:08 AM
Hi. Rading your post again, it looks like I kinda screwed up.
Lets try again!
Rob Dixon wrote:
> Hi Scott
>
> Scott E Robinson wrote:
> > Dear Perl experts,
> >
> > I'm trying to find the right regular expressions to do some simple
> > (?) string processing. Can anyone tell me how to do these?
> >
> > 1. Given a string consisting of substrings delimited by colons,
> > such as :B520:L201:M:M260:8:G607:,
>
> my $string = ':B520:L201:M:M260:8:G607:';
>
> > how can I
> > a. remove the single-character and all-numeric substrings (M
> > and 8 in this example), leaving the rest alone?
>
> This is an array of all the wanted substrings:
>
> my @wanted = $string =~ /[a-z]\w+/ig;
> print "@wanted\n";
>
> output
>
> B520 L201 M260 G607
I think that's right, although it assumes that the values that aren't
all-numeric start with an alpha.
> > b. remove all but the single-character and all-numeric
> > substrings and leave the rest alone?
>
> This is an array of all the wanted substrings:
>
> my @wanted = $string =~ /\b\w\b/ig;
> print "@wanted\n";
>
> output
>
> M 8
Right result, but fails to find '88'. Try:
my @wanted = $string =~ /\b\w\d*\b/ig;
> > c. remove all but single- or double-character substrings and
> > all-numeric substrings and leave the rest alone?
>
> This is an array of all the wanted substrings:
>
> my @wanted = $string =~ /\b[a-z]\w?\b/ig;
> print "@wanted\n";
>
> output
>
> M
This is right, I think.
> (Note that this won't find '8M', but your data doesn't look like
> that will come up.)
>
That's more like it!
Rob
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