Specifically, this might serve - 
use Regexp::Common qw /delimited/;
$str =~ /^$RE{delimited}{-delim=>'/'}$/;

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The $RE{delimited} regex accepts backslash escapes by default.

In reply to Re^2: Regex AND NOT with zero-width negative lookahead assertion by cxw
in thread Regex AND NOT with zero-width negative lookahead assertion by mldvx4

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