I have a string like this:
$str = "this is a test";
I want to validate $str
and return true if string is containing is
and it isn't containing test
. How can I do that?
Examples:
"this is a test" // false
"this is a tes" // true "is" exists and "test" doesn't exist
"this iss a tes" // false
"this iss a test" // false
Here is my pattern \bis\b(?!test)
. But it seems to just checks existing, I mean it also returns true when test
exists. I mean the result of following code us true which shouldn't be (because test
exists).
if (preg_match ("/\bis\b(?!test)/","this is a test")) {
return true;
} else {
return false;
}
Note: I'm really insist on doing that by regex.