regexFindAll
Returns a slice of all matches of the regular expression in the input string. The last parameter n determines the number of substrings to return, where -1 means return all matches
regexFindAll "[2,4,6,8]" "123456789" -1
The above produces [2 4 6 8]
regexFindAll
panics if there is a problem and mustRegexFindAll
returns an error to the
template engine if there is a problem.