Help with regular expression

[sondar]

Can anyone help me please?

I have a regular expression "^A .* B$"

If this matches against "A B A B" then how can I tell that ".*" was
matched against "B A"?

Thanks,
Campbell

 

[Alexander Mueller]

Can anyone help me please?

I have a regular expression "^A .* B$"

If this matches against "A B A B" then how can I tell that ".*" was
matched against "B A"?

Thanks,
Campbell

I am not familar to RegExp in .Net
In VBScript and JavaScript you'd define a submatch by
simply using paranthesis:

'VBScript
rx.Pattern = "^A( .* )B$"

and return the part inbetween by accessing the submatch.
There are multiple ways to do this, one is

'VBScript
sm = rx.replace("A B A B", "$1")



I know dotnet uses a different term then 'submatch'.
(i think they call it backreference instead ... not sure)
and a different method for retrieving it, but the basic mechanism
and the pattern are the same.

MfG,
Alex

 

[eBob.com]

I am certainly not a regex expert, but I think that what you need to search
for is "capture".

Good Luck, Bob

 

[sondar]

Thank you both, that was the push I needed. I needed to use named
groups, i.e. change the pattern to

"^A(?<mymatch>.*)B$"

I can then use the re.Match().Groups collection to return the value of
the mymatch group which in the case above would be "B A".

Cheers,
Campbell