Question

if i want to match some thing with javascript i can use foo.match(); but how can i check if it not match…

Answer 1

To be more explicit, I tend to use ! and .test(), e.g:

var hasNoMatch = !/myregex/.test(string);

Since since by the spec .match() returns null in the case of no matches, this works as well:

var hasNoMatch = !foo.match();

From the MDC documentation for .match() (much quicker resource most of the time:

If the regular expression includes the g flag, the method returns an Array containing all matches. If there were no matches, the method returns null.