Javascript Split Space Delimited String and Trim E

问题:

I need to split a keyword string and turn it into a comma delimited string. However, I need to get rid of extra spaces and any commas that the user has already input.

var keywordString = "ford    tempo, with,,, sunroof";

Output to this string:

ford,tempo,with,sunroof,

I need the trailing comma and no spaces in the final output.

Not sure if I should go Regex or a string splitting function.

Anyone do something like this already?

I need to use javascript (or JQ).

EDIT (working solution):

var keywordString = ", ,, ford,    tempo, with,,, sunroof,, ,";

//remove all commas; remove preceeding and trailing spaces; replace spaces with comma

str1 = keywordString.replace(/,/g , '').replace(/^\s\s*/, '').replace(/\s\s*$/, '').replace(/[\s,]+/g, ',');


//add a comma at the end
str1 = str1 + ',';

console.log(str1);

回答1:

You will need a regular expression in both cases. You could split and join the string:

str = str.split(/[\s,]+/).join();

This splits on and consumes any consecutive white spaces and commas. Similarly, you could just match and replace these characters:

str = str.replace(/[\s,]+/g, ',');

For the trailing comma, just append one

str = .... + ',';

If you have preceding and trailing white spaces, you should remove those first.

Reference: .split, .replace, Regular Expressions

回答2:

In addition to Felix Kling's answer

If you have preceding and trailing white spaces, you should remove those first.

It's possible to add an "extension method" to a JavaScript String by hooking into it's prototype. I've been using the following to trim preceding and trailing white-spaces, and thus far it's worked a treat:

// trims the leading and proceeding white-space
String.prototype.trim = function()
{
    return this.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
};

回答3:

In ES6:

var temp = str.split(",").map((item)=>item.trim());

回答4:

I would keep it simple, and just match anything not allowed instead to join on:

str.split(/[^a-zA-Z-]+/g).filter(v=>v);

This matches all the gaps, no matter what non-allowed characters are in between. To get rid of the empty entry at the beginning and end, a simple filter for non-null values will do. See detailed explanation on regex101.

var str = ", ,, ford,    tempo, with,,, sunroof,, ,";

var result = str.split(/[^a-zA-Z-]+/g).filter(v=>v).join(',');

console.info(result);

回答5:

If you just want to split, trim and join keeping the whitespaces, you can do this with lodash:

// The string to fix
var stringToFix = "The Wizard of Oz,Casablanca,The Green Mile";

// split, trim and join back without removing all the whitespaces between
var fixedString = _.map(stringToFix.split(','), _.trim).join(' == ');

// output: "The Wizard of Oz == Casablanca == The Green Mile"
console.log(fixedString);

<script src="https://cdn.jsdelivr.net/lodash/4.16.3/lodash.min.js"></script>