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  1. or download this
    XXX="/blah1/blah2/blah3/1234567890;arg=AAA123BBB456CCC"
#         alphanumeric: ^^^^^^^^^^
...
#                   fixed string: ^^^^^
#                        alphanumeric: ^^^^^^^^^^^^^^^
echo "$XXX" | perl -n -e 'if (m[^/.+/([^/\?\s]+)(?:;arg=)?]) {print "$
+1\n";}'
  2. or download this
    echo "$XXX" | perl -n -e 'if (m[^/.+/([^/\?\s;]+)(?:;arg=)?]) {print "
+$1\n";}'
                                             ^