Mongodb and mapreduce: full example for news word counts [github source]

The github source code located at:
https://github.com/elbasri/mongodb/blob/master/mapreduce

Full source:

// News Content (Body)

var map = function() {

var body = this.body;

if (body) {

str=body.replace(/<[^>]*>/g, ”);

str=str.replace(/<\s*br\/*>/gi, “\n”);

str=str.replace(/<\s*a.*href=”(.*?)”.*>(.*?)<\/a>/gi, ” $2 (Link->$1) “);

str=str.replace(/<\s*\/*.+?>/ig, “\n”);

str=str.replace(/ {2,}/gi, ” “);

str=str.replace(/\n+\s*/gi, “\n\n”);

body = str.toLowerCase().split(” “);

for (var i = body.length – 1; i >= 0; i–) {

if (body[i] && body[i].length>4) {

emit(body[i], 1);

}

}

}

};

// News Titles

var map = function() {

var title = this.title;

if (title) {

title = title.toLowerCase().split(” “);

for (var i = title.length – 1; i >= 0; i–) {

if (title[i] && title[i].length>4) {

emit(title[i], 1);

}

}

}

};

var reduce = function( key, values ) {

var count = 0;

values.forEach(function(v) {

count +=v;

});

return count;

}

// All Docs

// db.news.mapReduce(map, reduce, { out: “word_count” })

// Inline Out

// db.news.mapReduce(map, reduce, { out: { inline: 1 } })

// Limited

db.news.mapReduce(map, reduce, {limit: 1000, out: “word_count2” })

db.word_count.find().sort({ value: -1 }).limit(10)