OK, Let's say @edittypes = ( 'foo', 'bar', 'zoot' ). For each of these, map sets $_ to the array element, and spits out the return value of the block. So, map returns ( '\.foo', '\.bar', '\.zoot' ). These are joined with pipes; after executing the first line, you have $regex = '\.foo|\.bar|\.zoot'.

Now, since you don't appear to be matching to anything in the second line, I am guessing this came from inside a loop with an implicit value. Whatever $_ is equal to when the second line runs is matched against $regex, case insensitive. If there's no match, call the inerror function, whatever that may be.

Does that clear it up?

Update: Corrected escaping of backslash.

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