Your code will match only files named with one single digit (i.e "4" or "7")
because you match the beginning of the string with ^, then one digit with \d
and then the end of a string with $.


If you just want the number then use

($imgNumber =~ /^(\d+)/);
[download]

if you want the whole name of the file without the extention use

($imgNumber =~ /^(\d+.+)\.jpg/);
[download]

if you want something else be more precise in your question ;-)
si_lence