Question

Given a block of text like so:

"Hello world this is http://yahoo.com "

On keypress I’m looking at the text for links. I don’t want to look for links in text while the user is still typing, example:

"Hello world this is http://yahoo.co"

How can I get everything in the text var starting from the left, 0, all the way to the last white space, meaning I don’t get a url while the user is typing it?

Thanks

UPDATED

Typing Hello world this is http://yahoo.com should return Hello world this is http://yahoo.com

Typing Hello world this is http://yahoo.co should return Hello world this is

Answer 1

Two methods:

First, a regular expression:

var str    = "Hello world this is http://yahoo.co",
    expr   = /(.+\s).*$/
    result = str.match( expr )
;

console.log( result );
// => ["Hello world this is http://yahoo.co", "Hello world this is "]

console.log( result[1] );
// => "Hello world this is "

Second, lastIndexOf:

var str     = "Hello world this is http://yahoo.co",
    lastIdx = str.lastIndexOf( ' ' )
    result  = str.substr( 0, lastIdx + 1 )
;

console.log( result );
// => "Hello world this is "

This latter only works with spaces, however, as lastIndexOf doesn’t take a regular expression.