我将如何使用正则表达式来存储文档中某些单词的所有出现？

Question

I'm a JavaScript developer who gets weak in the knees when he sees regex.

But right now, I'm working on a side project that seems to require it.

I want to create an array of 'important words' (there are around 250 of them), and then scan through a giant document looking for and storing each occurrence of an 'important word' for analysis and further manipulation.

I have no idea where to start (or what to Google) when it comes to the regex part of this, nor do I know the expertise required for what I'm trying to do.

If I can get the 'important words' individually into an array, I know what to do. It's the steps leading up to that that I'm confused about.

Any basic advice or direction would be much appreciated.

Thanks!

Answer 1

What about doing something like this?

var list = ['test', 'west', 'pest', 'nest'], results = {},
    string = 'pesty test for the pest from the west test';
for (var i=0, l=list.length; i<l; i++) {
    var match = string.match(RegExp('\\b' + list[i] + '\\b', 'gi'));
    results[list[i]] = (match !== null) ? match.length : 0;
}
// results = {test: 2, west: 1, pest: 1, nest: 0}