How to remove part of a string in Javascript?

Question

I'm using Feedroll for showing RSS entries on my Tumblr.

Let's say I have:

document.write('<li class="rss-item"><a class="rss-item" href="http://mywebsite.com/arandomlink" target="_self"> [element1] element2 element3 element4</a><br />');
document.write('</li>');

element1 is a text "Thisismytext" (fixed length : 7)

element2 is a text "This Is My Text" (length not fixed)

element3 is a number "01" to "24" (fixed length : 2)

element4 is a text "THIS IS MY TEXT" (fixed length : 6 + space + 2)

(I have many entries and element1 and element4 don't change.)

I can't change the code from Feedroll or the titles of the entries.

Now, I would like to show my enrties ([element1] element2 element3 element4) like element 2 - element 3.

Example: [Thisismytext] This Is My Text 05 OTHER TEXT to This Is My Text - 05.

How do I do that?

I have tried split(), pop(), and substring() but I don't know how to use them.

And by the way, sorry for my English, I am French.

Try using regular expressions to match and parse the text values? — Stephen James
– Stephen James, Commented Jul 14, 2014 at 8:51
Well, I don't know exactly how to do that. But thank you for your answer. — CODE_01
– CODE_01, Commented Jul 14, 2014 at 8:53

Stephen James · Accepted Answer · 2014-07-14 09:07:33Z

1

Assuming you don't receive the elements individually and are just getting a bunch of markup that you want to reformat...

If you are receiving the string of text and you want to strip out the different elements, you might want to use a regular expression to match the elements.

The following expression would just matches the text [element1] element2 element3 element4 with the constraints that you mentioned.

http://www.regexr.com/3959m

regular expression : /\[(.{7})\]\s(.*)\s([0-9]{0,2})\s(.*)/g

sample text : [Thisism] This Is My Text 02 OTHER TEXT

matches :

enter image description here

If you are receiving the full HTML string, you'd have to alter the regular expression to handle the html tags.

More info on regular expressions here : http://www.regular-expressions.info/tutorial.html

answered Jul 14, 2014 at 9:07

Stephen James

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5 Comments

CODE_01 Over a year ago

I tried but I don't understand how to replace some elements of a string using regular expressions.

Stephen James Over a year ago

check this out developer.mozilla.org/en/docs/Web/JavaScript/Guide/…

CODE_01 Over a year ago

Okay so, I found how to do it :

var re = /\[(.{7})\]\s(.*)\s([0-9]{0,2})\s(.*)/; var str = "[Thisism] This Is My Text 02 OTHER TEXT"; var newstr = str.replace(re, "$2 - $3");

But now, I would like to fetch every

<li class="rss-item"><a class="rss-item" href="http://mywebsite.com/arandomlink" target="_self"> [element1] element2 element3 element4</a><br /></li>

and automatically replace it with newstr. Is it possible?

Stephen James Over a year ago

sure. with jQuery $(".rss-item").each(function(rssItem) { // do your stuff here with rssItem.text()}) or .html(), you'll have to check

CODE_01 Over a year ago

Btw, if it's more easy with PHP (I mean, the "search and replace" part), I have a private server.

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