Javascript: Check if string variable is in text

Question

I have a text string and an array of words. I am trying to see if the words appear in the text and if they do put them in another array.

I have tried:

var aray = ['dies','jam', 'jug', 'march', 'one', 'men', 'all'],
testText = "If one of them dies I will notice that one off my men is missing"
i,found = [];

for(i=0; i < aray.length; i++){
    searchTerm = "/\\b" + aray[i] + "/gi";
    found = testText.match(searchTerm)
}

But found is always "null"

I read that maybe I should construct a new RegExp object, so I tried:

for(i=0; i < aray.length; i++){
    searchTerm = "/\\b" + aray[i] + "/gi";
    found = testText.match(new RegExp(searchTerm, 'gi'));
}

But still found = "null". I have tried changing the regex but if I put the regex directly into the testText.match it works, ie:

searchTerm = "/\\b" + 'dies' + "/gi";

If you want to use a variable in RegEx pattern in JavaScript you must use the `New RegExp()` like this: `var searchTerm = new RegExp("\\b" + aray[i] + "\\b", "gi");` — erosman, Jul 09 '14 at 16:12

score 0 · Answer 1 · edited May 23 '17 at 11:57

0

You can use underscore or lodash or a custom array intersection function:

var array = ['dies','jam', 'jug', 'march', 'one', 'men', 'all'],
testText = "If one of them dies I will notice that one off my men is missing";

var diff = _.intersection(array, testText.split(' '));

console.log(diff);

--> ["dies", "one", "men"]

http://jsfiddle.net/S65Vd/1/

edited May 23 '17 at 11:57

Community

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1

answered Jul 09 '14 at 15:30

Dominic

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Sorry I mean intersection, difference is the opposite – Dominic Jul 09 '14 at 15:34
1

Thanks, that works. It is something new to me and I will have to find out why it works :-) – user2343618 Jul 09 '14 at 15:49

Javascript: Check if string variable is in text

1 Answers1