Conditional clause in match group pattern for regex pattern to trim String version

[SomenteRafael]

PROBLEM is I have e.g.

• "Version String" = ["1_0-release", "1_1_3", "1_2_0_0-release", "1_2_1", "1_2_1_1-release"]
  and want to sanitize it to
• ["1.0", "1.1.3", "1.2.0.0", "1.2.1", "1.2.1.1"].

BY NOW I could clean 3-segmented-only versions with

• "Trim String Version With RegEx" = "(\d+)(\d+)(\d+)" and
• "Match Group to use for..." = "$1.$2.$3"

I could use

• "Trim String Version With RegEx" = "(\d+)(\d+)?(\d+)?_?(\d+)?" and
• "Match Group to use for..." = "$1.$2.$3.$4"
  and that applied to my list, i i'm right, that would result in matching
• versions = ["1.0..", "1.2.3.", "1.2.0.0", "1.2.1.", "1.2.1.1"]
  so by now the I think it's the best result i'm gonna reach without the feature I want, which is a way to use a conditional clause in the match group pattern field, currently with simple variable substitution (specifically, to me, i need to include or not a dot if a group is not(empty or unnuded) so, used.

THE SYNTAX could be, for my purpose...:
$1.$(.)2$(.)3$(.)4

I don't know if regex excludes )( chars to be used in named patterns but anyways, not a problem anyways...