We are currently trying to get the url of thumbnails from the RSS of Tena Bookmark using regular expressions.
<!DOCTYPE html>
<head>
<metacharset="utf-8">
</head>
<body>
<div class="message"></div>
<script src="http://d3js.org/d3.v3.js" charset="utf-8"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<script src="https://www.google.com/jsapi"></script>
<script>
varimagelist=[];
google.load("feeds", "1");
function initialize() {
varfeed = new google.feeds.feed("http://feeds.feedburner.com/hatena/b/hotentry");
feed.setNumEntries(-1);
feed.load(function(result){
if(!result.error){
for (vari=0;i<result.feed.entries.length;i++) {
variable=result.feed.entries[i];
var first_image=entry.content.match(/(http:){1}[\S_-]+\.(?:jpg|gif|png)/);
first_image[0] = first_image[0].replace(/(\.[^.]+$)/, "_l$1");
imagelist.push(first_image);
console.log (imagelist)
}
}
});
}
google.setOnLoadCallback(initialize);
console.log (imagelist[0])
</script>
</body>
</html>The above is the source you are creating, but if you run this program and look at the console, you'll see
0: Array [2]
0: "https://cdn-ak.b.st-hatena.com/entryimage/273819903-1450199417_l.jpg"
1: "http:"
index:350
input: "<blockquote title=" Is Mr. Kojima, a famous game developer, established a new company leaving Konami? : Nihon Keizai Shimbun">cite>img src="https://cdn-ak.favicon.st-hatena.com/?url=http%3A%2F%2Fwww.nikkei.com%2F"alt=">a href="http://www.nikkei.com/article/DGXLZO95184030W5A211C1TI5000/">Is famous game developer Kojima established a new company leaving Konami? : Nihon Keizai Shimbun </a>/cite>p>>a href="http://www.nikkei.com/article/DGXLZO95184030W5A211C1TI5000/">img src="https://cdn-ak.b.st-hatena.com/entryimage/273819903-1450199417.jpg" alt="Does famous game developer Kojima establish a new company leaving Konami? : Is Mr. Kojima, a famous game developer of Nihon Keizai Shimbun title=, established a new company leaving Konami? : Hideo Kojima, a famous game creator known for the Nihon Keizai Shimbun's Metal Gear series, left Konami Digital Entertainment on the 15th.It is expected to set up a new company to continue making games and sell them to Sony Computer Entertainment (SCE)'s PlayStation (PS), a game console. It will set up a new company with its Konami-era subordinates.A representative "Metal Gear" series…</p>p>a href="www.nikkei.com/article/DGXLZO95184030W5A211C1TI5000/://www.nikkei.com/article/DGXLZO95184030W5A211C1TI5000/">img src="http://b.hatena.ne.jp/entry/image/http://http://b.hatena.ne.jp/entry/http" alt="Hatena Bookmark - Famous Game Developer Kojima Leaves Konami Is Established New Company? - Nihon Keizai Shimbun title= Hatena Bookmark - Is Mr. Kojima, a famous game developer, established a new company leaving Konami? ：日本経済新聞" border="0" style="border:none"></a> <a href="http://b.hatena.ne.jp/append?http://www.nikkei.com/article/DGXLZO95184030W5A211C1TI5000/"><img src="http://b.hatena.ne.jp/images/append.gif" border="0" alt="はてなブックマークに追加" title="はてなブックマークに追加"></a></p></blockquote><img src="http://feeds.feedburner.com/~r/hatena/b/hotentry/~4/y3bfYN4dQBo"height="1" width="1" alt="">"
This url is necessary for such things as
0: "https://cdn-ak.b.st-hatena.com/entryimage/273819903-1450199417_l.jpg"
Other unnecessary
1: "http:"
It will be acquired up to .
How do I rewrite the regular expression part to get only 0: url?
Thank you for your help.
If you change entry.content.match(/(http:){1}[\S_-]+\.(?:jpg|gif|png)/) to entry.content.match(/(?:http:){1}[\S_-]+\.(?:jpg|gif|png)/), the first_image[1] disappears.In terms of the regular expression neighborhood, the former () is referred to as the capture parenthesis, and the latter (?:) is referred to as the non-capture parenthesis.The extension already uses non-captured parentheses.
But you may only want to look at first_image[0] without worrying about it.
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