Regex. Find paragraph containing some word

Question

In text like this:

1 bla bla bla bla bla2 bla bla bla bla TEXT bla3 bla bla bla bla bla4 bla bla bla bla TEXT bla5 bla bla bla bla bla

I have to find paragraphs (between p tags) that contain string "TEXT".
I tried .*?(TEXT).*?<\/p>
and I tried (?!).*?(TEXT).*?<\/p>

But it doesnt solve the problem.

Kerwin · Accepted Answer · 2017-03-31T08:15:37.993

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((?!<\/p>).)*(TEXT) to make sure 'Text' in one 

See demo

var regex = /<p>((?!<\/p>).)*?(TEXT).*?<\/p>/g;
var text = '<p>1 bla bla <em>bla</em> bla bla</p><p>2 bla bla <em>bla</em> bla TEXT bla</p><p>3 bla bla <em>bla</em> bla bla</p><p>4 bla bla <em>bla</em> bla TEXT bla</p><p>5 bla bla <em>bla</em> bla bla</p>';
console.log(text.match(regex));

edited Mar 31 '17 at 08:15

answered Mar 31 '17 at 07:38

Kerwin

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Great! Thank you! – Shimon S Mar 31 '17 at 08:51

score 0 · Answer 2 · edited Mar 31 '17 at 07:20

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Since it is a string, (said by @Rajesh), just create a div element and appent to it.

get All the p tags using querySelectorAll and then use forEach function.

Check the innerHTML for /TEXT/ and if found, push it into array.

In the below program, the array a contains the 2 matching tags

var str="<p>1 bla bla <em>bla</em> bla bla</p><p>2 bla bla <em>bla</em> bla TEXT bla</p><p>3 bla bla <em>bla</em> bla bla</p><p>4 bla bla <em>bla</em> bla TEXT bla</p><p>5 bla bla <em>bla</em> bla bla</p>";
var div=document.createElement("div");
div.innerHTML=str;
var a=[];
div.querySelectorAll("p").forEach(x=>{if(/TEXT/.test(x.innerHTML)) a.push(x);});
console.log(a);

If you don't want the  tags, just push the textContent

var str="<p>1 bla bla <em>bla</em> bla bla</p><p>2 bla bla <em>bla</em> bla TEXT bla</p><p>3 bla bla <em>bla</em> bla bla</p><p>4 bla bla <em>bla</em> bla TEXT bla</p><p>5 bla bla <em>bla</em> bla bla</p>";
var div=document.createElement("div");
div.innerHTML=str;
var a=[];
div.querySelectorAll("p").forEach(x=>{if(/TEXT/.test(x.innerHTML)) a.push(x.textContent);});
console.log(a);

edited Mar 31 '17 at 07:20

Rajesh

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answered Mar 31 '17 at 07:10

Sagar V

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no. Someone downvoted mine too. @Rajesh Check this. is it ok now? – Sagar V Mar 31 '17 at 07:17
I have removed my vote as it produces correct output, but OP is looking for regex. – Rajesh Mar 31 '17 at 07:20
ah. is that you. Thanks. I appreciate downvotes with comments. But I really hate people who downvote without any comment. your comment make me improve my answer. – Sagar V Mar 31 '17 at 07:20
I think this is OP's problem _I have to find paragraphs (between p tags) that contain string "TEXT"._ @Rajesh – Sagar V Mar 31 '17 at 07:20
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Yup. As said, *it produces correct output*, also glad to help in any way. :-) – Rajesh Mar 31 '17 at 07:22

Julesezaar · Answer 3 · 2023-04-20T07:20:00.477

0

Sometimes you just have to add a delimiter like (...) or {...} or /.../ or [...] So try it like this:

/<p>.*?(TEXT).*?<\/p>/

But as Barman pointed it out, this does not always stay within one paragraph. If you really want to only select 1 paragraph you need something like this:

(?:<p |<p>)(?:(?!\/p>).|\n)*(TEXT).*?<\/p>

(?:) Starts with <p or  and ?: in the beginning means "do not capture this in output"
(?:(?!\/p>).|\n)* Any character or newline .|\n except a closing /p> and ?: in the beginning means "do not capture this in output"
(TEXT) The word TEXT of course
.*? any character with lazy quantifier "?" .*? to stop on the shortest match (before we have a 
<\/p> And must end with closing  tag

And this one allows multiline text too!

edited Apr 20 '23 at 07:20

answered Mar 31 '17 at 07:12

Julesezaar

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This will match also the first paragraph in given text (first paragraph doesn't contain "TEXT") – Shimon S Mar 31 '17 at 09:50
This doesn't limit the match to a single paragraph. – Barmar Apr 20 '23 at 00:24
You are totally right, I updated my answer. – Julesezaar Apr 20 '23 at 07:15

score -2 · Answer 4 · answered Mar 31 '17 at 07:13

You can try something like this:

Create a regex to get all groups
Loop over these regex to check for necessary search key and filter out the matches.

var str = "<p>1 bla bla <em>bla</em> bla bla</p><p>2 bla bla <em>bla</em> bla TEXT bla</p><p>3 bla bla <em>bla</em> bla bla</p><p>4 bla bla <em>bla</em> bla TEXT bla</p><p>5 bla bla <em>bla</em> bla bla</p>";

var groupRegex = /(?:^|<p>)(.*?)(?:<\/p>|$)/g;
var searchRegex = /text/i
var groups = str.match(groupRegex);

var result = groups.filter(function(s){ return searchRegex.test(s) })

console.log(result)

Regex. Find paragraph containing some word

4 Answers4

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