check if text contains string javascript code example
Example 1: check if string contains javascript
var str = "Hello world, welcome to the universe.";
var n = str.includes("world");
Example 2: javascript check if character exists in string
"FooBar".includes("oo");
"FooBar".includes("foo");
"FooBar".includes("oo", 2);
~"FooBar".indexOf("oo");
~"FooBar".indexOf("foo");
~"FooBar".indexOf("oo", 2);
!!~"FooBar".indexOf("oo");
!!~"FooBar".indexOf("foo");
!!~"FooBar".indexOf("oo", 2);
Example 3: javascript contains substring
var str = "We got a poop cleanup on isle 4.";
if(str.indexOf("poop") !== -1){
alert("Not again");
}
Example 4: js string does not contain
"this is the string".indexOf("cake");
"this string has cake".indexOf("cake");