what is the best way to check if a string exists in another?
Possible Duplicate:
JavaScript: string contains
I'm looking for an algorithm to check if a string exists in another.
For example:
'Hello, my name is jonh LOL.'.contains('Hello, my name is jonh'); //true
'LOL. Hello, my name is jonh'.contains('Hello, my name is jonh'); //true
Thanks in advance.
Use indexOf :
'Hello, my name is jonh LOL.'.indexOf('Hello, my name is jonh') > -1; //true
'LOL. Hello, my name is jonh'.indexOf('Hello, my name is jonh') > -1; //true
You can also extend String.prototype to have a contains function:
String.prototype.contains = function(substr) {
return this.indexOf(substr) > -1;
}
'Hello, my name is jonh LOL.'.contains('Hello, my name is jonh'); //true
'LOL. Hello, my name is jonh'.contains('Hello, my name is jonh'); //true
As Digital pointed out the indexOf method is the way to check. If you want a more declarative name like contains then you can add it to the String prototype.
String.prototype.contains = function(toCheck) {
return this.indexOf(toCheck) >= 0;
}
After that your original code sample will work as written
How about going to obscurity:
!!~'Hello, my name is jonh LOL.'.indexOf('Hello, my name is jonh'); //true
if(~'LOL. Hello, my name is jonh'.indexOf('Hello, my name is jonh'))
alert(true);
Using Bitwise NOT and to boolean NOTs to convert it to a boolean than convert it back.
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