search any substring in the input string

A new Pig UDF STRING_SEARCH_ALL that Implementing regex for searching keyword(substring) in a line of string, and all matched substrings will be stored as individual tuples in a bag, i.e.

 output: ({(a),(b),(c)})

Help us to find all regex matches, for example, we may use FLATTEN(STRING_SEARCH_ALL(string, regex)) to list all matches for an easier view of output.