regex question

[obob]

I've been looking for a while and I need help with following regex problem
I want to pass strings in this format to the script:

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cmd_someCommand_par_someParameter

How would you use regex (or perhaps a less CPU taxing method?)
to break the string into variables?

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cmd = someCommand
par = someParameter

[mikeyww]

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part := StrSplit(A_Args.1, "_"), cmd := part.2, par := part.4
MsgBox, 64, Parts, cmd = %cmd%`n`npar  = %par%

Or:

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part := StrSplit(A_Args.1, "_"), v1 := part.1, %v1% := part.2, v2 := part.3, %v2% := part.4
MsgBox, 64, Parts, % v1 " = " %v1% "`n`n" v2 "  = " %v2%

[boiler]

Or using RegEx:

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RegExMatch(A_Args.1, "^cmd_([^_]*)_par_(.*)", m), cmd := m1, par := m2
MsgBox, % "cmd = " cmd "`npar = " par

[obob]

Thank you, beautiful people!

[obob]

Or using RegEx:

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RegExMatch(A_Args.1, "^cmd_([^_]*)_par_(.*)", m), cmd := m1, par := m2
MsgBox, % "cmd = " cmd "`npar = " par

Thank you, I like this solution because it allows to have _underscore as part of the command and parameter.
However when I parse a string without parameter, it also omits cmd.

The strings I parse are sometimes only commands without parameter.
Do you know how to adjust RegExMatch to allow an optional parameter?

[boiler]

You could do this:

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RegExMatch(A_Args.1, "^cmd_([^_]*)(_par_(.*))?", m), cmd := m1, par := m3

[obob]

thank you. You set me on the right path to solve the problem.
I wanted commands to be able to use underscores in their names,
so I adjusted the convention of how the strings will be written, so it allows multiple underscores

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RegExMatch((A_Args.1, "^cmd_([^,]*)(,\s?par_(.*))?", m), cmd := m1, par := m3