Can someone help me to find the regular expression for this using javascript

Question

I need to retrieve 71drwec4 , 51drdsf3 from the below expression or any other characters other than 71drwec3 between "a_secret"> and </div> or something similar to that:

<div class="fs" id="a_secret">71drwec4</div>

<div class="fs" id="a_secre">51drdsf3</div>

<div class="fs" id="a_secr">54451drwec3</div>

you need a regular formula if you want to regex it, in other words, you need to know exactly what the expression should check for each time — SpYk3HH, Mar 30 '12 at 21:31
@colin : i am really week at regular expression...i tried this patt1 = /a_secret\/(\d+)"/; — vishnu Simbu, Mar 30 '12 at 21:32
Just as a side note, you shouldn't have more than one element with the same ID on a page — dougajmcdonald, Mar 30 '12 at 21:32
Can you simply find all `div`'s with class="fs", loop over them and get the text? — Colin Brock, Mar 30 '12 at 21:34
are you trying to loop through in the DOM with javascript, or is this text you're trying to evaluate with javascript? — Anony372, Mar 30 '12 at 21:57

score 1 · Answer 1 · edited Mar 30 '12 at 21:37

1

Do you have to use a regex for this? if the text to parse is say, HTML and you can use jQuery, you can use the .text() method here to retrieve the content from with an ID.

E.g.

var whatIwant = $("#a_secret").text();

http://api.jquery.com/text/

edited Mar 30 '12 at 21:37

Cristian Sanchez

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answered Mar 30 '12 at 21:35

dougajmcdonald

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Its possible by jquert..but i need regular expression.thank you – vishnu Simbu Mar 30 '12 at 21:38
4

what's the reason for regex? can you give a bit more background as to what you need to do? perhaps there is a simpler route. – dougajmcdonald Mar 30 '12 at 21:39
Because i am retrieving another page source using http get request..i am saving that whole page source as an string.and with that string i am finding that particular value. – vishnu Simbu Mar 30 '12 at 21:41
I still like this answer the best. Even if you are getting the page over http get request, you can parse the html in the resulting string and use jQuery (or even just regular dom manipulations). See http://stackoverflow.com/questions/888875/how-to-parse-html-from-javascript-in-firefox – Cameron Mar 30 '12 at 22:03
Is there are need to save the page? or can you get away with simply parsing the HTML on the fly? reason I ask is that you can again use jQuery with methods such as .load() to target a specific area of a page you're making a request to and perform an action (in this case loading into a DOM node on your own page) based on the result – dougajmcdonald Mar 31 '12 at 08:31

score 1 · Accepted Answer · edited May 23 '17 at 12:11

how about this:

var pattern = /<div class="fs" id=".*?">(.*?)<\/div>/gm;
var src = '<div class="fs" id="a_secret">71drwec4</div> \n <div class="fs" id="a_secre">51drdsf3</div> \n <div class="fs" id="a_secr">54451drwec3</div>';
var match;
while (match = pattern.exec(src)) {
  alert(match[1]);
}

Change it as you need it (I don't know what your id's will look like or if they all have the same class, etc). If you are looking to match elements from inside your own page, jQuery would be way easier, as other posters have mentioned.

And... obligatory reference to other SO post: RegEx match open tags except XHTML self-contained tags

Madbreaks · Answer 3 · 2012-03-30T21:57:56.477

0

// Match against your HTML, store matches in new 'matches' Array
var matches = htmlStr.replace(/<div.*?>(.+?)<\/div>/g, "$1 ").trim().split(' ');

...this assumes there are no spaces in the values you're trying to retrieve, you'd need to tweak it a bit if spaces are valid. But against your provided test HTML:

<div class="fs" id="a_secret">71drwec4</div>
<div class="fs" id="a_secre">51drdsf3</div>
<div class="fs" id="a_secr">54451drwec3</div>

...this approach yields:

["71drwec4", "51drdsf3", "54451drwec3"]

Cheers

edited Mar 30 '12 at 21:57

answered Mar 30 '12 at 21:45

Madbreaks

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but i need to retrieve only content of id="a_secret i.e..71drwec4 – vishnu Simbu Mar 30 '12 at 21:48

score 0 · Answer 4 · answered Mar 30 '12 at 22:50

One of these might work with javascript.

overrun protected with <name>

str = '
<div
  (?=\s) 
  (?= (?:[^>"\']|"[^"]*"|\'[^\']*\')*? (?<=\s) id \s*=
      (?: (?>              \s* ([\'"]) \s* a_secret \s* \g{-1} )
        | (?> (?!\s*[\'"]) \s*             a_secret (?=\s|>) )   
      )
  )
  (?> \s+ (?:".*?"|\'.*?\'|[^>]*?)+ 
>
  ) (?<! /> )

(?<not_71drwec3>(?:(?!71drwec3).)*?) </div\s*>
';

unprotected with <name>

str = '
<div
  (?=\s) 
  (?= (?:[^>"\']|"[^"]*"|\'[^\']*\')*? (?<=\s) id \s*=
      (?:               \s* ([\'"]) \s* a_secret \s* \g{-1}
        |  (?!\s*[\'"]) \s*             a_secret (?=\s|>) 
      )
  )
  \s+ (?:".*?"|\'.*?\'|[^>]*?)+ 
>
  (?<! /> )      // line is worthless when unprotected

(?<not_71drwec3>(?:(?!71drwec3).)*?) </div\s*>
';

unprotected no <name> without \g{} notation

str = '
<div
  (?=\s) 
  (?= (?:[^>"\']|"[^"]*"|\'[^\']*\')*? (?<=\s) id \s*=
      (?:               \s* ([\'"]) \s* a_secret \s* \1    // Group 1
        |  (?!\s*[\'"]) \s*             a_secret (?=\s|>) 
      )
  )
  \s+ (?:".*?"|\'.*?\'|[^>]*?)+ 
>
  (?<! /> )      // line is worthless when unprotected

((?:(?!71drwec3).)*?) </div\s*>                           // Group 2
';

Can someone help me to find the regular expression for this using javascript

4 Answers4