Here is how I would write this substitution:

$my{'msg'}=~ s{\Q$name\E}{<img src="interface/$image">}g
[download]

Explanations:

• the most important is to use \Q$name\E: this preventsthe regexp engine to interpret meta-characters (such as /) in $name. Without this (admiteddly obscure) incantation the content of $name is interpolated, and used in the regexp,
• < and " don't need to be backslashed,
• also if you use a alternate delimiter to / (I often use s{}{}) you don't need to backslash /.

Also note that "Help"is not a very... helpful title for a question. Posts are archived and can be searched, so using a descriptive like "problem with / in regexp" or something similar would make it easier for future users to retrieve and use your post. It would also make it more likely that people would take the time to answer your question.