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Re: Looking for alternative syntax for assigning variables based on regex matches

by rsFalse (Chaplain)
on Mar 02, 2021 at 10:28 UTC ( #11129009=note: print w/replies, xml ) Need Help??


in reply to Looking for alternative syntax for assigning variables based on regex matches

With non-destructive /r modifier (and lookahead):
perl -wle '$foo = "a hello w"; $foo = $foo =~ s/(?=.*(hello)).*/$1/sr;
+ print $foo'

[download]
OUTPUT: 
hello

[download]
And if you want only to use your capture, just: 
...; print $foo =~ s/(?=.*(hello)).*/$1/sr;

[download]
In the later example a value of $foo didn't change.
*Updated

+one more way: 
...; $foo =~ /hello(?{ $foo = $& })/; print $foo

[download]
Though it looks like bad practice to change a variable while it is in use.

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