Hey, please can someone help me work out a code for this function.

Name of function and its parameter
match(string,pattern)

Description
returns true if all the individual LETTERS of pattern appear in string (regardless of order) (case insensitive)

Examples
match("abcdef","@C2D!") returns true
match("abcdef","CAfe") returns true
match("abcdef","CG") returns false

Thanks!