ASP match regular function using Matchs instance _ regular expression

Description
The match object can only be created by using the RegExp object's Execute method, which actually returns a collection of Match objects. All of the Match object properties are read-only.
When you execute a regular expression, you may produce 0 or more Match objects. Each match object provides access to the string found by the regular expression search, the length of the string, and the location of the matching index.

The following code illustrates the use of the Match object:

Function regexptest (PATRN, STRNG)
Dim regEx, Match, matches ' Set variable.
Set regEx = New RegExp ' establishes a regular expression.
Regex.pattern = Patrn ' Set mode.
Regex.ignorecase = True ' Sets whether case sensitive.
Regex.global = True ' Sets global substitution.
Set matches = Regex.execute (strng) ' performs a search.
For the Match in matches ' traverses the matches collection.
Retstr = retstr & "Match" & I & "found at position"
Retstr = retstr & Match.firstindex & ". Match Value is "'
Retstr = retstr & Match.value & "'." & VbCRLF
Next
Regexptest = Retstr
End Function

  msgbox (Regexptest ("is.",    is1   is2   is3    is4 ")