Prettify button on view metrics page changes query

[davidarcher]

REPRO STEPS:

1. Navigate to the Argus viewmetrics page
2. Paste in the following to the text input box

GROUPBY(-15m:-2m:foo.bar.-.-:some.metric.*.here{tag=baz}:avg:3m-avg, #(someRegexForGrouping)#, #SUM#)

3. Click the Prettify button

EXPECTED:
The query entered should be formatted without changing the actual text of the query

GROUPBY(
  -15m:-2m:foo.bar.-.-:some.metric.*.here{tag=baz}:avg:3m-avg,
  #(someRegexForGrouping)#,
  #SUM#
)

ACTUAL:
The prettified version of the query has an extra comma between the closing parenthesis of the regex field and the # symbol.

GROUPBY(
  -15m:-2m:foo.bar.-.-:some.metric.*.here{tag=baz}:avg:3m-avg,#(
    someRegexForGrouping
  ),
  #,#SUM#
)

[prestonfff]

Yes, this happens when parentheses are included in regex. Let me confirm with my team if regex in expression supports characters like brackets or commas.