c# - Regex patterns to distinguish four digit numbers -

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hi have c# application accepts 4 digit extension number , sets mask it. have situation 2 different masks need applied depending on number.

first: if number starts 47 or 5 return mask a.  second: if number starts 6 or 55 return mask b.

so setup regex way , not sure why getting set wrong.

//here trying say, start 47 or 5 next 3 digits taking number match first = regex.match(num, "^(47|(5[0123456789]{3}))");  //anything start 6 or 55 next 2 digits taking numbers 0-5 match secong = regex.match(num, "(6|55[123450]{2})");

if give use above input num=5850 or num=5511 true both 5850 should use mask , 5511 should use mask b

how fix this??

thanks!

these should you.

this matches 4 digit number starting 47 or 5, excluding 5 second digit.

^(47|5([0-4]|[6-9]))\d{2}$

this matches 4 digit number starting 6 or 55.

^(6\d|55)\d{2}$

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