Using JavaScript regex to split text by line breaks

Question

Using JavaScript regex to split text by line breaks

What is the best way to split a long string of text into individual lines? And why does this code snippet return "line1" twice?

/^(.*?)$/mg.exec('line1\r\nline2\r\n');

["line1", "line1"]

By enabling the multi-line modifier, I made sure that the ^ and $ characters match the beginning and end of each line. The global modifier was also turned on so that all lines are captured.

The reason for using a regex split instead of String.split is because I need to account for both Linux (\n) and Windows (\r\n) line endings.

javascript regex newline

Answer 1

Answer №1

lineArray = lineString.match(/[^\r\n]+/g);

In agreement with Tim's explanation, the result includes both the entire match and capture. It seems that regex.exec(string) stops after finding the first match even without the global modifier, while string.match(regex) respects the global modifier.

Answer 2

lineArray = lineString.match(/[^\r\n]+/g);

In agreement with Tim's explanation, the result includes both the entire match and capture. It seems that regex.exec(string) stops after finding the first match even without the global modifier, while string.match(regex) respects the global modifier.

Answer 3

Answer №2

Utilize

outcome = subject.split(/\r?\n/);

The regular expression provided results in the duplication of line1 as it is both the complete match and the content within the initial capturing group.

Answer 4

Utilize

outcome = subject.split(/\r?\n/);

The regular expression provided results in the duplication of line1 as it is both the complete match and the content within the initial capturing group.

Answer 5

Answer №3

I believe the following characters are considered as newlines:

\r followed by \n
\n followed by \r
\n present alone
\r present alone

To process this, you can use

var re=/\r\n|\n\r|\n|\r/g;

arrayofLines=lineString.replace(re,"\n").split("\n");

to get an array of all lines, including the empty ones.

OR

You can also use

arrayOfLines = lineString.match(/[^\r\n]+/g);

to get an array of non-empty lines only.

Answer 6

I believe the following characters are considered as newlines:

\r followed by \n
\n followed by \r
\n present alone
\r present alone

To process this, you can use

var re=/\r\n|\n\r|\n|\r/g;

arrayofLines=lineString.replace(re,"\n").split("\n");

to get an array of all lines, including the empty ones.

OR

You can also use

arrayOfLines = lineString.match(/[^\r\n]+/g);

to get an array of non-empty lines only.

Answer 7

Answer №4

A more advanced regular expression that can effectively handle various line ending combinations, even when mixed in the same file, while also eliminating empty lines:

let content = text.split(/[\r\n]+/g);

For better cleanliness, use this regex with whitespace trimming:

let content = text.trim().split(/\s*[\r\n]+\s*/g);

Answer 8

A more advanced regular expression that can effectively handle various line ending combinations, even when mixed in the same file, while also eliminating empty lines:

let content = text.split(/[\r\n]+/g);

For better cleanliness, use this regex with whitespace trimming:

let content = text.trim().split(/\s*[\r\n]+\s*/g);

Answer 9

Answer №5

Unicode Guidelines for Line Breaks

Guidelines outlined in Unicode® Technical Standard #18 specify the rules for defining line boundaries. Within that section, a regular expression is provided to identify all line boundaries. By utilizing this regex, we can create a JavaScript function that effectively splits a given string at any line boundary, including empty lines and maintaining leading and trailing whitespace:

const splitLines = s => s.split(/\r\n|(?!\r\n)[\n-\r\x85\u2028\u2029]/)

The necessity of the negative look-ahead portion ((?!\r\n)) may not be immediately clear, but it is advised within the Unicode document 🤷‍♂️.

In the aforementioned document, there is a recommendation to establish a meta-character within a regular expression for identifying all line ending characters and sequences. Perl utilizes \R for this purpose. Regrettably, JavaScript does not currently feature such a meta-character. Despite this, there doesn't appear to be a TC39 proposal addressing this deficiency as of now.

Answer 10

Unicode Guidelines for Line Breaks

Guidelines outlined in Unicode® Technical Standard #18 specify the rules for defining line boundaries. Within that section, a regular expression is provided to identify all line boundaries. By utilizing this regex, we can create a JavaScript function that effectively splits a given string at any line boundary, including empty lines and maintaining leading and trailing whitespace:

const splitLines = s => s.split(/\r\n|(?!\r\n)[\n-\r\x85\u2028\u2029]/)

The necessity of the negative look-ahead portion ((?!\r\n)) may not be immediately clear, but it is advised within the Unicode document 🤷‍♂️.

In the aforementioned document, there is a recommendation to establish a meta-character within a regular expression for identifying all line ending characters and sequences. Perl utilizes \R for this purpose. Regrettably, JavaScript does not currently feature such a meta-character. Despite this, there doesn't appear to be a TC39 proposal addressing this deficiency as of now.

Answer 11

Answer №6

Begin by replacing every occurrence of \r\n with \n, and after that use the String.split method.

Answer 12

Begin by replacing every occurrence of \r\n with \n, and after that use the String.split method.

Answer 13

Answer №7

http://example.com/yhn98fj/

const textLines = text.match(/^.*((\r\n|\n|\r)|$)/gm);

I implemented a similar approach. You can find my code in the provided link above.

Answer 14

http://example.com/yhn98fj/

const textLines = text.match(/^.*((\r\n|\n|\r)|$)/gm);

I implemented a similar approach. You can find my code in the provided link above.

Using JavaScript regex to split text by line breaks

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Unicode Guidelines for Line Breaks

Answer №6

Answer №7

Similar questions

javascript The event handler is not functioning properly for the dynamically loaded AJAX content

Tips for effectively engaging with a Component's aggregationUnleash the full potential of

What are the steps to modify data within the root component?

Receiving a blank array upon calling res.json() in Node.js script

Create a timestamp with Javascript rendering

What is the best way to hide the background of an extension's HTML?

Individual Ajax data

Having Trouble with Imported JavaScript File in Astro

How can I attach events to newly generated elements without using jQuery?

What causes my paragraph textContent to vanish after briefly displaying its value?

The regex string parameter in node.js is not functioning properly for matching groups

Strategies for effectively managing numerous API requests

The Firebase JQuery .on method is incrementally updating individual values in an array instead of updating them all simultaneously

Modifying the app.css file in the source tab of dev tools does not cause any changes in the DOM when working with a

Utilize separate production environments for each client on the NodeJS server to ensure seamless operation and

Thick labels in Chart.js are shortened with three dots

Can a jQuery/JavaScript script be run standalone?

I'm feeling completely lost trying to understand cors in conjunction with fetch, particularly when an options request is

Capture the Promise Rejection

Is it better to utilize angular's $interval or a promise to execute code upon completion of an api call?