Re: Looking for a regular expression for the following pattern.

[ikegami]

[0-9_]*[a-zA-Z][a-zA-Z0-9_]*

So to check if an entire string matches one of your sequences,

if ($str =~ /^[0-9_]*[a-zA-Z][a-zA-Z0-9_]*\z/) {
   ...
}

[Skeeve]

++ for finally making me clear what's \z is good for…