正则表达式无法正常工作

Question

ok so let me explain the current situation:

i get some strings from COM1, i filtered this to show only the needed information and thus i have only strings like this:

NTF,IDAS,RXSTAT,IND,01-0100,01-0131,+,-63,81

now the problem is that in this example i need to get the number: 131 and ONLY that number,

i have tried to achieve this with Regex but with no success.

i have this as my Regex:

Regex.Match(line, ",01-0100,01-0([0-9]{3})").Value.ToString()

and expect that to return me the

131

but instead it returns:

,01-0100,01-0131

can anybody help me with this problem?

Answer 1

You are using the wrong group index. Group 0 is the entire match, group 1 is the value for the first group.

Regex.Match(line, ",01-0100,01-0([0-9]{3})").Groups[1].Value.ToString()

You could also name your group:

Regex.Match(line, ",01-0100,01-0(?<mygroup>[0-9]{3})").Groups["mygroup"].Value.ToString()

Oh, and as a group's value is always a string:

Regex.Match(line, ",01-0100,01-0(?<mygroup>[0-9]{3})").Groups["mygroup"].Value;