Regular expression captures

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Erik Tamminga - 17 Apr 2005 22:08 GMT

Hi,

From the following string I would like to capture text.

String: This action has been executed via Console

First of all I like to know if this is the text I need: it must contain
"This action has been executed via".
Secondly I would like to know "Console"

How can Regular expressions help me in this. I've tried various things with
the RegEx class but I'm having troubles retrieving "Console". The
match.Captures collection always seems to contain the string searched, not
only the captured part.

RegEx r = RegEx( "This action has been executed", RegExOptions.IgnoreCase)
if (r.Matches( myString).Count > 0)
{
Here matches are found and r.Matches[0].Captures.Count > 0.
Why is ...Captures.Count > 0, I did ask for a capture?
}

RegEx q = RegEx( "(C\w+)", RegExOptions.IgnoreCase)
if (q.Matches( myString).Count > 0)
{
Here matches are found and r.Matches[0].Captures.Count > 0.
This is where I expected the capture!!
}

regards,

Erik

Reply to this Message

Jon Shemitz - 17 Apr 2005 22:42 GMT

> From the following string I would like to capture text.
>
[quoted text clipped - 8 lines]
> match.Captures collection always seems to contain the string searched, not
> only the captured part.

The captures will always include the substring that matches the whole
regex in the Match object and in Groups[0]. Explicit captures start at
Groups[1]. This is by design, and broadly matches the behavior of Perl
regexes.

Try using

Regex("This action has been executed via (.*)",
RegExOptions.IgnoreCase)

and looking at Groups[1].

> if (r.Matches( myString).Count > 0)

Don't write code like this. Readings Matches.Count forces the regex to
find every match. Use

Match M = R.Match(Text);
if (M.Success)
string Capture = M.Groups[1].Value;

Signature

www.midnightbeach.com

Reply to this Message

Regular expression captures

Free Magazines