Delimiters
Perl allows us to pick our own delimiters.
#!/bin/perl -l
=begin
Backslashes are used to escape forward slashes,
used by Perl for search and replace
It's a little ugly, but Perl allows us to pick our own delimiters
Escape is not necessary anymore
s|regex|replacement|modifiers OR
s{regex}{replacement}modifiers
=cut
$a = 'jfriedl@regex.info';
$a =~ s{(\w+@\w+(\.\w+))}{<a href="mailto:$1">$1</a>}g;
print $a;
# <a href="mailto:jfriedl@regex.info">jfriedl@regex.info</a>
Readability
Perl allows /x modifier, to rewrite regex on multiple lines.
#!/bin/perl -l
=begin
Readability modifier /x
Perl allows /x modifier, to rewrite regex on multiple lines
This modifier does two simple but powerful things
First, it causes most whitespaces to be ignored
Secondly, it allows comments with a leading #
Example: Search and replace email address
=cut
$a = 'jfriedl@regex.info';
$a =~ s{
# capture the email address to $1
(
# username regex
[-a-zA-Z0-9._]+
# hosname regex
@[-a-z0-9]+(?:\.[-_a-z0-9]+)*\.(?:com|edu|info)
)
}{<a href="mailto:$1">$1<\/a>}gix; # /x
print $a;
# <a href="mailto:jfriedl@regex.info">jfriedl@regex.info</a>
Last update: 285 days ago
