'Regex for specific numbers and special characters

I want to extract the values 9.6%,2021,4th from the below input string and tried with different solutions but not displaying output as expected. input string: Gross Domestic Product decreased by 5.9% in volume in the fourth quarter 2021 and by 9.6% in 2021 - 4th Quarter 2021

var pattren = "^-?\\d*(\\.\\d+)?$";
var result  = Regex.Match(s, pattren);
c++sharp


Solution 1:[1]

A solution I came up, might not be optimal though, as it takes extra step I think.

  1. Get the wanted part by (\d+\.*\d*%)\s*in\s*(\d{4})\s*-\s*(1st|2nd|3rd|4th)

  2. Since there's a nuance in your question, there're 2 possibilities as the next step:

  • Replace() in and - to , to get string "9.6%,2021,4th"
  • Group 1,2,3 of the Match will be "9.6%", "2021" and "4th".

Problem is, dealing with text always has surprises waiting for you. Test for more cases and adjust the method to deal with exceptional inputs.

For reference:

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Xiang Wei Huang

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