I am using regex to capture hashtags from a string like this:
var words = "#hashed words and some #more #hashed words";
var tagslistarr = words.match(/#\S+/g);
console.log(tagslistarr);
this will return an array like this;
["#hashed", "#more", "#hashed"]
question: how can i remove the # hash sign from each of the array items?
this is what i would like in the end
["hashed", "more", "hashed"]
Try:
words.match( /#\S+/g ).map( function(x) { return x.replace(/^#/,''); } );
A better way to do this would be zero-width assertions; unfortunately, JavaScript does not support look-behind assertions, only look-ahead. (As an aside, here is a blog post about mimicking lookbehind assertions in JavaScript. I can't say as I care much for any of the solutions, but it's good reading nonetheless. I sure hope lookbehind assertions make it into ES6.)
As pointed out by SimonR in the comments below, Array.prototype.map is not available in IE8 and below. However, it's easy enough to polyfill:
if( !Array.prototype.map ) {
Array.prototype.map = function(f) {
var r = [];
for( var i=0; i<this.length; i++ ) r[i] = f(this[i]);
return r;
}
}
Array.prototype.map was introduced in JavaScript 1.6 in Nov 2005. So it's more than seven years old. If you (or your clients) are using a browser that isn't implementing seven year-old features, maybe it's time to switch, hmmm? Also, it's easy enough to polyfill Array.prototype.map.
var words = "#hashed words and some #more #hashed words";
var tagslistarr = words.match(/#\S+/g);
tagslistarr = tagslistarr.map(function(x) { return x.substr(1); } );
console.log(tagslistarr)
prints
["hashed", "more", "hashed"]
Use a capturing group in your regex:
words.replace(/#(\S+)/g, '$1');
EDIT:
To get them as an array:
var tagslistarr = words.match(/#\S+/g);
for( var i = 0, l = tagslistarr.length; i < l; i++ ) {
tagslistarr[ i ] = tagslistarr[ i ].substr( 1 );
}
var words = "#hashed words and some #more #hashed words";
var regexp = /#(\S+)/g; // Capture the part of the match you want
var results = [];
var match;
while((match = regexp.exec(words))) // Loop through all matches
results.push(match[1]); // Add them to results array
console.log(results);
