如何从字符串数组中删除字符串？

Question

Basically, I have an array of strings

var array_strings = ['string1', 'string2', 'string3']

And I would like to know using that array, how could I find every piece of a string that contains something from the array array_strings and remove it.

For example, If I have the string var hello = 'string1 Hello string2'

I would like it to output only Hello and remove string1 and string2 .

Answer 1

Iterate over the array and use the string replace method to remove the strings from the array. We turn the string into a regular expression through the RegExp constructor. This will allow for multiple replaces and the use of a variable within our expression.

 var array_strings = ['string1', 'string2', 'string3'], str = "string1 hello string2", printStr = (str, removables) => { for (let removable of removables) { let re_removable = new RegExp(removable,"g"); str = str.replace(re_removable, "").trim(); } return str; }; console.log(printStr(str, array_strings));

Answer 2

One possibility would be to join the array of strings you want to remove by | , then construct a regular expression from that, and .replace with '' :

 const array_strings = ['string1', 'string2', 'string3']; const pattern = new RegExp(array_strings.join('|'), 'g'); const hello = 'string1 Hello string2'; console.log(hello.replace(pattern, ''));

If you also want to remove the leading/trailing spaces, then use .trim() as well.

Answer 3

If you are going to have only words as per your example with no commas/punctuation etc then you could also simply split the string and then Array.filter it via Array.includes :

 const str = 'string1 Hello string2 there string3', arr = ['string1', 'string2', 'string3']; console.log(...str.split(' ').filter(x => !arr.includes(x)))

It is a simpler approach in scenario where you do not have complex sentences/string data for which you would need String.replace via RegEx etc.