c# - How do I allow only one hyphen (-),only one space( ),only one apostrophe (') in a regular expression -


i have text box last name of user. how allow 1 hyphen (-),only 1 space( ),only 1 apostrophe (') in regular expression

you can use negative lookahead each of 3 chars want avoid :

^(?!.*-.*-.*)(?!.*'.*'.*)(?!.*\s.*\s.*)[a-za-z- ']+$

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