Update numeric constant regular expression (#45)
Update numeric constant regular expression (#45)

* Update numeric constant regular expression to comply better with wildcard '?' and inferred length Z and X constants.

Fixes mshr-h/vscode-systemverilog-support#12 and fixes mshr-h/vscode-systemverilog-support#35

mshr-h/vscode-systemverilog-support,mshr-h/vscode-systemverilog-support