How can I remove newline characters at the beginning and ending of a string?

Question

I am having string as below:

var str = "\ncat\n"

from the above string i want the output to be

str = "cat"

Is there any best way to do that?

Answer 1

You need to trim the whitespace characters around the string, with String.prototype.trim , like this

console.log("\ncat\n".trim());
// cat

You can also remove all the whitespace characters in the beginning and ending of the string using a regular expression, like this

console.log("\t\t\t \r\ncat\t\r\n\r".replace(/^\s+|\s+$/g, ''));
// cat

The regular expression means that match one or more whitespace characters ( \\s means whitespace characters) at the beginning of the string ( ^ means beginning of the string) or at the end of the string ( $ means the end of string). The + after \\s means that match one or more times. The g after / means global match, it actually makes the RegEx match more than once. So, whenever the match is found, it will be replaced with an empty string.

Answer 2

You should look at the substr function . In your case, you could do:

 var string = '\\ncat\\n'; document.write(string.substr(1, string.length - 2));