A VBScript equivalent of PHP’s preg_match

Const PREG_PATTERN_ORDER  = 1
Const PREG_SET_ORDER      = 2
Const PREG_OFFSET_CAPTURE = 256
Function preg_match(pattern, ByVal subject, ByRef matches, flags, offset)

    Dim matchAll,matchone
    Dim cnt,helper

    preg_match = false

    set helper = new RegExp_Helper
    helper.parseOption(pattern)

    Set matchAll = new RegExp
    With matchAll
        .IgnoreCase = helper.withIgnoreCase
        .Global     = false
        .pattern    = helper.withPattern
        .MultiLine  = helper.withMultiLine
    End With

    set helper = Nothing

    If not is_empty(offset) Then
        offset = int(offset)
        subject = Mid(subject,offset)
    End If

    offset = intval( offset )

    If vartype(matches) <> 8 Then
        Set matchone = matchAll.execute(subject)
        Set matchAll = Nothing
        If matchone.count = 0 Then exit Function

        If flags = PREG_OFFSET_CAPTURE Then

            ReDim matches(1)
            matches(0) = matchone(0).value
            matches(1) = offset + matchone(0).FirstIndex
        Else
            ReDim matches(0)
            matches(0) = matchone(0).value
        End If

        preg_match = true
    Else
        preg_match = matchAll.Test(subject)
        Set matchAll = Nothing
    End If

End Function

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