so i would like to get words between underscores after second occurence of underscore
this is my string
ABC_BC_BE08_C1000004_0124
I've assembled this expresion
(?<=_)[^_]+
well it matches what i need but only skips the first word since there is no underscore before it. I would like it to skip ABC and BC and just get the last three strings, i've tried messing around but i am stuck and cant make it work. Thanks!
You can use a non-regex approach here with Split
and Skip
:
var text = "ABC_BC_BE08_C1000004_0124";
var result = text.Split('_').Skip(2);
foreach (var s in result)
Console.WriteLine(s);
Output:
BE08
C1000004
0124
See the C# demo .
With regex, you can use
var result = Regex.Matches(text, @"(?<=^(?:[^_]*_){2,})[^_]+").Cast<Match>().Select(x => x.Value);
See the regex demo and the C# demo . The regex matches
(?<=^(?:[^_]*_){2,})
- a positive lookbehind that matches a location that matches the following patterns immediately to the left of the current location:
^
- start of string (?:[^_]*_){2,}
- two or more ( {2,}
) sequences of any zero or more chars other than _
( [^_]*
) and then a _
char [^_]+
- one or more chars other than _
Usign .NET there is also a captures collection that you might use with a regex and a repeated catpure group.
^[^_]*_[^_]*(?:_([^_]+))+
The pattern matches:
^
Start of string [^_]*_[^_]*
Match any char except an _
, match _
and again any char except _
(?:
Non capture group
_([^_]+)
Match _
and capture 1 or more times any char except _
in group 1 )+
Close the non capture group and repeat 1 or more times For example:
var pattern = @"^[^_]*_[^_]*(?:_([^_]+))+";
var str = "ABC_BC_BE08_C1000004_0124";
var strings = Regex.Match(str, pattern).Groups[1].Captures.Select(c => c.Value);
foreach (String s in strings)
{
Console.WriteLine(s);
}
Output
BE08
C1000004
0124
If you want to match only word characters in between the underscores, another option for a pattern could be using a negated character class [^\W_]
excluding the underscore from the word characters in between:
^[^\W_]*_[^\W_]*(?:_([^\W_]+))+
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