正则表达式匹配提取

Question

I've got some text that follows the format

text ( text + numbers | text + numbers | 2-4 digit number text)

I'm interested in extracting the 2-4 digit number from this string in C#. My regEx string is

.*?\|.*?\|([0-9][0-9][0-9]?[0-9]?)

This correctly returns whether the string matches or not, but I'm not able to extract just the digits.

I've tried calling regex.match(input).Value, but it returns the entire input.

I must be missing something - any help is appreciated :)

Answer 1

Your regex defines a Group - inside parenthesis with the value you want. Using just Value from the Match object returns the entire string that was matched for the regex.

Use regex.Match(input).Groups[1].Value for extracting the number.