use strict;
my $str = '<img width="594" height="392" src="/sites/it_kb/SiteAssets/Pages/exploding%20the%20VDI%20vDesktop/VDI3.PNG" alt="" style="margin:5px;width:619px;height:232px" />';
my $regex = qr/(?<=src=)"[^" ]*\/(?=[^\/"]*\/)/p;
my $subst = '';
my $result = $str =~ s/$regex/$subst/rg;
print "The result of the substitution is' $result\n";
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html