Javascript search string using array

Question

I am trying to search the text of a body of a webpage against a list of predefined words in an array. Then record how many instances of each word appeared.

<script>
var str = document.body.innerText;
var array = [];
array[0] = "Statement";
array[1] = "Documents"; 
var regexp = new RegExp( '\\b' + array.join('\\b|\\b') + '\\b').test(str);
document.write(regexp)
</script>

That one is only returning true or false. Or is there a way to make this one work?

var str = document.body.innerText;
var n = str.match(use array here)
document.write(n)

Also check out this question: stackoverflow.com/questions/1072765/… — Safirah
– Safirah, Commented Jan 29, 2017 at 10:29
@NonPolynomial innerText used to be non-standard but things have changed now. Hate that MDN redirects you to their cheesy localized page rather than the English version. — GOTO 0
– GOTO 0, Commented Jan 29, 2017 at 11:02

NonPolynomial · Accepted Answer · 2017-01-29 10:49:12Z

1

Try this

n = str.match(new RegExp('\\b(' + arr.join('|') + ')\\b', 'ig')) || []).length;

make a dynamic Regex with i and g flag

new RegExp('\\b(' + arr.join('|') + ')\\b', 'ig')

define an empty array as fallback
```
str.match(regex) || []
```

return the length of the results array or the fallback array

str.match(new RegExp('\\b(' + arr.join('|') + ')\\b', 'ig')) || []).length;

answered Jan 29, 2017 at 10:49

NonPolynomial

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1 Comment

Dante Over a year ago

I'm probably not skilled enough to implement this. I thought it would be really easy. I will hit tutorials a bit more.

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