I need to convert a VB6(which I'm not fammiliar with) project to C# 4.0 one. The project contains some regexes for string validation.
I need to know if the regexes behave the same in both cases, so if i just copy the regex string from the VB6 project, to the C# project, will they work the same?
I have a basic knowledge of regexes and I can just about read what one does, but for flavors and such, that's a bit over my head at the moment.
For example, are these 2 lines equivalent?
VB6:
isStringValid = (str Like "*[!0-9A-Z]*")
C#:
isStringValid = Regex.IsMatch(str, "*[!0-9A-Z]*");
Thanks!
The old VB Like operator, despite appearances, is not a regular expression interface. It's more of a glob pattern matcher. See http://msdn.microsoft.com/en-us/library/swf8kaxw.aspx
In your example:
Like "*[!0-9A-Z]*"
Matches strings that start and end with any character (zero or more), then doesn't match an alphanumeric character somewhere in the middle. The regular expression for this would be:
/.*[^0-9A-Z].*/
EDIT To answer your question: No, the two can't be used interchangeably. However, it's fairly easy to convert Like's operand into a proper regular expression:
Like RegEx
========== ==========
? .
* .*
# \d
[abc0-9] [abc0-9]
[!abc0-9] [^abc0-9]
There are a few caveats to this, but that should get you started and cover most cases.
In a word, yes.
These are the same. Some quick googling should give you answers to more complex issues.
来源：https://stackoverflow.com/questions/12820896/vb6-and-c-sharp-regexes