c# - Regex for numbers after a certain string part -

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i'm trying extract numbers inside url regex. 

example input: http://localhost:23089/generic-url-segment-c?p=5  expected output : 5  example input: http://localhost:23089/generic-url-segment-c?p=12&sort=5  expected output: 12

first tried numbers mixture of string.replace,string.indexof , substring thought regex easier.

so far tried using ((p=)?=.) can't 5 only.

and shown in second example, value might 2 digit value or there might other parameters after it. maybe search between p= , & necessary don't know how regex behaves in absence of parameters.

try below pattern. plus matches 1 or more can 1 or more digits -

 p=(\d+)

the brackets group value of match within group use 

match.groups[0].value




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