ruby - How to match given characters in string -

given:

fruits = %w[banana apple orange grape] chars = 'ep' 

how can print elements of fruits have characters of chars? tried following:

fruits.each{|fruit| puts fruit if !(fruit=~/["#{chars}"]/i).nil?)} 

but see 'orange' in result, not have 'p' character in it.

just fun, here's how might regular expression, magic of positive lookahead:

fruits = %w[banana apple orange grape] p fruits.grep(/(?=.*e)(?=.*p)/i) # => ["apple", "grape"] 

this nice , succinct, regex bit occult, , gets worse if want generalize it:

def match_chars(arr, chars)   expr_parts = chars.chars.map {|c| "(?=.*#{regexp.escape(c)})" }   arr.grep(regexp.new(expr_parts.join, true)) end  p match_chars(fruits, "ar") # => ["orange", "grape"] 

also, i'm pretty sure outperformed or of other answers.