regex syntax of [tabspace]*

I have a recipe like this

:0fhw
* ^Subject:[     ]*SV: *\/[^ ].*
|formail -i"Subject: Re: $MATCH" -A"X-Note: Unnationalized RE (SV)"

where the empty [ ] is a tab followed by a space.

Am I correct in my assumption that

        [        ]*SV:

means "Any number of tabs OR a spaces before a literal 'SV:' " ?


Thanks

TjL



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