c# - Regular expression for specific number of digits -

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i want write regular expression in c# inputs specific number of numbers.

like writing regular expression validate 5 digits number "12345"

use following regex regex.ismatch method

^[0-9]{5}$

^ , $ anchors match beginning , end of string (respectively) prevent match found in middle of long string, such 1234567890 or abcd12345efgh.

[0-9] indicates character class specifies range of characters 0 9. range defined unicode code range starts , ends specified characters. {5} followed behind quantifier indicating repeat [0-9] 5 times.

note solution of ^\d{5}$ equivalent above solution, when regexoptions.ecmascript specified, otherwise, it equivalent \p{nd}, matches unicode digits - here the list of characters in nd category. should check documentation of language using shorthand character classes matches.

i suggest read through documentation. can use other resources, such http://www.regular-expressions.info/, always check on documentation of language using.


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