use strict;
my $str = '<img xmlns="http://www.w3.org/1999/xhtml" src="http://10.206.38.34:8080/resource/resources/aktuelle_Ressourcen/eService/Bilder/uebersicht-router.png?contextId=eservice_1.0.0.qualifier" alt="Bild Übersicht Router" title="Übersicht Router" />';
my $regex = qr/(<img.*?src="([^"]+\?contextId[^"]+)"[^>]+>)/p;
if ( $str =~ /$regex/ ) {
print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n";
# print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n";
# print "Capture Group 2 is $2 ... and so on\n";
}
# ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p'
# Named capture groups can be called via $+{name}
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