perl how to remove last '_'?

In perl, how to write this regex ?

my $line = "job_name_1_" ; #end with '_'

$pattern = "_$"; # tried "\_$", still doesn't w开发者_开发知识库ork

if($line =~ m/$pattern/){
    # remove last "_" ?
}

-#output should be "job_name"

how to do this ?

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To remove the last underscore character, you just need to do this:

$line =~ s/_$//;

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To remove a trailing underscore: (foo__ ⇒ foo_, foo_bar ⇒ foo_bar)

$line =~ s/_\z//;

To remove all trailing underscores: (foo__ ⇒ foo, foo_bar ⇒ foo_bar)

$line =~ s/_+\z//;

To remove the last underscore: (foo__ ⇒ foo_, foo_bar ⇒ foobar)

$line =~ s/_(?!.*_)//s;

$line =~ s/^.*\K_//s;

---

$subject =~ s/_(?=[^_]*$)//;

Sorry if someone else has also posted this :)

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Try this:

$test = "test_";
$test = $1 if($test=~/(.*)_$/);
print $test