.net Regex sharing a sequence of matches

Question

Knowing Regex does not allow me, and I need help.

I am trying to take string input that might look like this

@"RRR:domsd\ddf:sdf:dsf:f"

or

@"sds4:kwertss\wegggds:rowdf"

and in both cases, separate everything from the beginning and after \, but before the first :that appears after firt \.

Thus, the results will be as follows:

RRR:domsd\ddf
sds4:kwertss\wegggds

if there was no match, if no sequence was found : \ :.

I have tried the following two registers so far

1st: @".*[:].*[\\].*[:]"which matches all last :, not first after\

2nd: @"(.+?:.+?):(.+)"which just matches the whole line

Answer 1

, :

^[^:]*:[^\\]*\\[^:]*(?=:)

regex

• ^ -
• [^:]* - 0+, :
• : -
• [^\\]* - 0+, \
• \\ - \
• [^:]* - 0+, :
• (?=:) - , :.

#:

var m = Regex.Match(s, @"^[^:]*:[^\\]*\\[^:]*(?=:)");
var res = string.Empty;
if (m.Success) 
{
     res = m.Value;
}

Answer 2

( )

(^.*\\.*?):

.

Answer 3

: ^(.*:.*[\\][^:]*):. , : \ :. .

.