Check if value matches any regex in a list

Question

I have encountered some situations where I need to check if a value matches a regex in a list of regexes. For instance, say I have a list of regexes which match filetypes:

['gundo', 'nerdtree', 'git*']

I need to find out if the filetype of the current file matches any of these regexes. The way I would do it currently would look like this:

fun! IsIgnored()
    for ignored_ft in ignored_filetypes
        if &filetype =~ ignored_ft
            return 1
        endif
    endfor
    return 0
endfun

However, it would be nice if there was a shorter way of doing this. Does vim have a function to do this, or do I just have to stick with the for loop?

Answer 1

I did define lh#list#match_re() (based on a loop for the purpose of finding which regex from a list is matched by a text).

However, in you case, why don't you just test &ft =~ join(ignored_filetypes, '\|') ?

Answer 2

This should do the same:

fun! IsIgnored()
    return index(map(['gundo', 'nerdtree', 'git*'], '&filetype =~ v:val'), 1) > -1
endfun

We first map the expression &filetype =~ v:val to every entry in our array, this will return either [0, 0, 0] if there are no matches, or [0, 1, 0] if (for example) nerdtree matches.
We then use index() to check if the array that map() returns has an entry with a value of 1 (index() returns -1 on no matches).