can regex contains function?

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

can regex contains function? I want convert the first character of words upcase. The code below does not work.

#!/usr/bin/env perl
my $t = ' aa bb cc';
$t =~ s/(\s)(\w)/${1}uc($2)/g;
print($t);
[download]

Comment on can regex contains function? Download Code

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Re: can regex contains function? by choroba (Cardinal) on Jun 19, 2020 at 07:49 UTC
> can regex contains function? Yes, it can. That's what `/e` is for. `$t =~ s/(?<=\s)(.)/uc $1/ge;` [download] But you don't need it here: `$t =~ s/(?<=\s)(.)/\U$1/g;` [download] `map{substr$_->[0],$_->[1]\|\|0,1}[\\|\|{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^ARGV,3]`	[reply] [d/l] [select]
Re: can regex contains function? by soonix (Canon) on Jun 19, 2020 at 07:29 UTC
Yes you can, see perlretut and perlrequick. However, for the special case of upcasing the first letter, there is the ucfirst function. Similiar matter has also been discussed here in the monastery: Capitalize the 1st letter of each word, see also in perlfaq 4: How do I capitalize all the words on one line?	[reply]
Re^2: can regex contains function? by toothedsword (Sexton) on Jun 19, 2020 at 07:44 UTC
Thank you so much! Now I know how to solve this specific question. But do you know can I instert a function to the regex?	[reply]
Re^3: can regex contains function? by Anonymous Monk on Jun 19, 2020 at 12:46 UTC
If I understand your question, the first responder answered it: use the `/e` qualifier.	[reply] [d/l]
Re^4: can regex contains function? by toothedsword (Sexton) on Jun 20, 2020 at 03:08 UTC