Javascript adding variable to a regular expression

Question

I've written the following function in Typescript:

public searchPosts(keyword ? : string): Post[] {
  return this._posts.filter(function(post) {
    if (post.title.search(new RegExp('money', 'gi')) >= 0) {
      return post;
    }
  });
}

It's working just fine but, I need to make it a little dynamic so that instead of hardcoded value i.e. money, I can put my keyword variable in RegExp (new RegExp(keyword, 'gi')). But doing so does not return anything even for 'money' as a keyword.

Any ideas on what I'm doing wrong here?

Why are you returning the post in the filter? I got it to work using ES6 (keyword = '') => this._posts.filter(post => post.title.search(new RegExp(keyword, 'gi')) >= 0) — evolutionxbox
– evolutionxbox, Commented Jul 5, 2017 at 9:53
replacing did not work. I'm returning post that matches the criteria? — Subhan
– Subhan, Commented Jul 5, 2017 at 9:55
I believe filter function: Returns the elements of an array that meet the condition specified in a callback function. — Subhan
– Subhan, Commented Jul 5, 2017 at 9:56

Yordan Nikolov · Accepted Answer · 2017-07-05 10:13:18Z

2

This is how it should work

  var keyword = '345';
  var f = ['1234', '3456'].filter(function(post) {
    return (post.search(new RegExp(keyword, 'gi')) >= 0);
  });
  
  console.log(f);

This is your function in pure JS

var posts = [{title: '1234'}, {title: '3456'}];

function searchPosts (keyword) {
  return posts.filter(function(post) {
    return (post.title.search(new RegExp(keyword, 'gi')) >= 0);
  });
}

console.log(searchPosts('345'));

If this doesnt work, the problem is somewhere else ;].

edited Jul 5, 2017 at 10:13

answered Jul 5, 2017 at 10:00

Yordan Nikolov

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3 Comments

Subhan Over a year ago

public searchPosts(keyword?: string): Post[] {     return this._posts.filter(function(post) {       return (post.title.search(new RegExp(keyword, 'gi')) >= 0);     });   }

What am I missing here?

Subhan Over a year ago

public searchPosts(keyword?: string): Post[] {     return this._posts.filter(function(post) {       return (post.title.search(new RegExp('money', 'gi')) >= 0);     });   }

this gives me the desired result but as soon as I replace the search string with keyword it does not work. Even console.log for keyword is as expected. :/

Yordan Nikolov Over a year ago

I've edited my answer. Your function seems OK. As you can see in my answer when you provide a string to the function it returns the desired result, so it is working just fine. That's what I can help you with. If you provide the code in the Plunker, can try more.

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