Question

I need following regexp such as.. the parenthesis are just to show the words

(abc) => pass
(abc ) => pass * abc with trailing white space
(abc ..blah..) => pass * ..blah.. means any chars containing spaces
(abcd) => fail

is there any good idea to do?

I trimmed the string so basically the first two cases are the same
but i couldn t make it fail when (abcd) comes in

Answer 1

if (/abc/im.test(subject)) {
    // Successful match
} else {
    // Match attempt failed
}

Answer 2

var doesItPass = (stringToValidate.split(" ")[0] == "abc") ? false : true;

Answer 3

Use regex:

/^abcs*$/

这样做是令人遗憾的。