I would like regex to match if and only if the string is none, family or work (but not my family, for example).
Why the following code results with "match" ? Why ^ and $ do not work ?
var regex = new RegExp("^none|family|work$"); var str = "my family"; document.write(regex.test(str) ? "match" : "no");
The | operator has low precedence, so you effectively have (^none)|(family)|(work$), which matches anything beginning with none, containing family or ending with work.
Use this instead:
Your regex matches either:
- “none” at the beginning of the string;
- “family” anywhere in the string; or
- “work” at the end of the string.
What you probably want instead is
var regex = new RegExp("^(none|family|work)$");