Catenate_numbers - way to avoid joining on space and comma?

catenate_numbers is useful for joining numbers separated by hyphen, as it allows a non-segmented search term to match against segmented numbers in the document, e.g.

Document: 02 6287-1455
Search term: 0262871455 (will match with catenate_numbers)

However, sometimes numbers in the document might be like:
0262871455 0262871477 0262871499
0262871455,0262871477, 0262871499

However with catenate_numbers both will become one long string 026287145502628714770262871499 will which probably never match any search term.

It would be nice if we could specify the character to/to not join on with catenate_numbers, to get around this problem.

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