Regex.Match and Regex.Split combinations

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Hi all,
In my application I want to split a string into two pieces, I know we can do that by using "Regex.Split ".But in my case the condition is little bit different.
See,
My string is "012AA23SB45AA78"
if I use Regex.Split("012AA23SB45AA78","AA") will return a string array like
012
23SB45
78
but I need just two strings one is "012AA23SB45" and the other is "78".(means split the string into two pieces where the last Regex.match occurred. Is there is any possibilities to do this using the combinations of Regex.match and Regex.Split....??

Thanks in advance
-Manuprasad M

Posted 6-Jan-15 1:31am

Manu Prasad

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Arjsrya 6-Jan-15 7:38am

I don't think there is a straight forward approach.Check the length of string array and Leave the last string & concatenate other strings.

Zoltán Zörgő 6-Jan-15 7:39am

Is there any login in the input string? The format is always xAAyAAz?

3 solutions

Solution 3

If you need everything before the last AA, you can simply use Regex.Match also, with "^(.*)AA.*$". The first group will match your substring.

Posted 6-Jan-15 1:42am

Zoltán Zörgő

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OriginalGriff · Accepted Answer · 2015-01-06T01:39:00

Regex.Split isn't what you need here - you are probably better going with a "stock" Match operation and using the groups, or better still, just doing it manually via LastIndexOf and Substring:

C#

string inp = "012AA23SB45AA78";
int index = inp.LastIndexOf("AA");
string start = inp.Substring(0, index);
string end = inp.Substring(index + 2);

E.F. Nijboer · Accepted Answer · 2015-01-06T01:38:00

Solution 1

Why not use a combination of string.LastIndexOf and string.Substring to do it?

Try something like this:

var firstPart = s.Substring(0, s.LastIndexOf('AA'));
var lastPart = s.Substring(s.LastIndexOf('AA') + 2);

Good luck!

Posted 6-Jan-15 1:38am

E.F. Nijboer

Updated 6-Jan-15 1:42am

v3