javascript check if string contains character

// With ES6 MDN docs .includes()
"FooBar".includes("oo"); // true
"FooBar".includes("foo"); // false
"FooBar".includes("oo", 2); // false (2 is the start position for the search)

// E: Not suported by IE - instead you can use the Tilde opperator ~ (Bitwise NOT) with .indexOf()
~"FooBar".indexOf("oo"); // -2
~"FooBar".indexOf("foo"); // 0
~"FooBar".indexOf("oo", 2); // 0 (parameter 2 is the start position for the search)

// Used with a number, the Tilde operator effective does ~N => -(N+1). Use it with double negation !! (Logical NOT) to convert the numbers in bools:
!!~"FooBar".indexOf("oo"); // true
!!~"FooBar".indexOf("foo"); // false
!!~"FooBar".indexOf("oo", 2); // false

4
8
Awgiedawgie 440215 points

                                    var str = "We got a poop cleanup on isle 4.";
if(str.indexOf("poop") !== -1){
	alert("Not again");
}
//use indexOf (it returns position of substring or -1 if not found)

4 (8 Votes)
0
4.17
6
Phoenix Logan 186120 points

                                    var email = "[email protected]";
if(email.includes("@")){
  console.log("Email is valid");
}
else{
  console.log("Email is not valid");
}
// includes return boolean, if your string found => true else => false

4.17 (6 Votes)
0
3.8
6
Krish 100200 points

                                    if (your_string.indexOf('hello') > -1)
{
  alert("hello found inside your_string");
}

3.8 (5 Votes)
0
4
8
Awgiedawgie 440215 points

                                    "FooBar".includes("oo"); // true

"FooBar".includes("foo"); // false

"FooBar".includes("oo", 2); // false

4 (8 Votes)
0
4.33
9
A-312 69370 points

                                    var string = "foo",
var substring = "oo";

console.log(string.includes(substring));

4.33 (9 Votes)
0
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