Steps to obtain the index of a regex match for every occurrence

Question

Steps to obtain the index of a regex match for every occurrence

I have a string

CO12dadaCO2dafdCO345daaf

I need to retrieve all instances of CO followed by numbers /CO(\d*)([\s\S]*)/, until the next CO appears.

In this scenario, I expect the following output:

['CO12dada', 'CO2dafd', 'CO345daaf']

The regex pattern I attempted also captures all subsequent CO occurrences at once, rendering it ineffective.

While str.search helps locate the index of the first match with a regex, I require the indexes for every instance found.

javascript regex

Answer 1

Answer №1

let inputString = 'CO12dadaCO2dafdCO345daaf';
let regexResult = inputString.match(/(CO.*?)(?=CO|$)/g);
console.log(regexResult);

Answer 2

let inputString = 'CO12dadaCO2dafdCO345daaf';
let regexResult = inputString.match(/(CO.*?)(?=CO|$)/g);
console.log(regexResult);

Answer 3

Answer №2

Use the .split() method to extract your matches:

console.log("CO12dadaCO2dafdCO345daaf".split(/(?!^)(?=CO)/))

Output:

[
  "CO12dada",
  "CO2dafd",
  "CO345daaf"
]

(?!^)(?=CO) = locates the empty string before the substring CO, except at the beginning of the string.

Answer 4

Use the .split() method to extract your matches:

console.log("CO12dadaCO2dafdCO345daaf".split(/(?!^)(?=CO)/))

Output:

[
  "CO12dada",
  "CO2dafd",
  "CO345daaf"
]

(?!^)(?=CO) = locates the empty string before the substring CO, except at the beginning of the string.

Answer 5

Answer №3

What about this:

DOG\w+?(?=DOG|$)

Check out the demo here: https://regex101.com/r/hJKabc/1

In essence: a "non-greedy" matching of all "word characters" after "DOG" followed by a lookahead for another "DOG" or end-of-string.

If you also wish to include "non-word characters," you can adjust the regex to

DOG[\w\W]+?(?=DOG|$)

This modification will even work on something like

"DOG12barkDOG2woof,barkDOG345tailwag"

and provide matches like:

["DOG12bark", "DOG2woof,bark", "DOG345tailwag"]

.

Answer 6

What about this:

DOG\w+?(?=DOG|$)

Check out the demo here: https://regex101.com/r/hJKabc/1

In essence: a "non-greedy" matching of all "word characters" after "DOG" followed by a lookahead for another "DOG" or end-of-string.

If you also wish to include "non-word characters," you can adjust the regex to

DOG[\w\W]+?(?=DOG|$)

This modification will even work on something like

"DOG12barkDOG2woof,barkDOG345tailwag"

and provide matches like:

["DOG12bark", "DOG2woof,bark", "DOG345tailwag"]

.

Answer 7

Answer №4

With the power of JavaScript, you have the ability to utilize

CO[^]*?(?=CO|$)

CO[^]*? Find CO, followed by any character including newlines as few times as possible
(?=CO|$) Positive lookahead, ensuring that either CO or the end of the line follows

Explore the regex demo here

Answer 8

With the power of JavaScript, you have the ability to utilize

CO[^]*?(?=CO|$)

CO[^]*? Find CO, followed by any character including newlines as few times as possible
(?=CO|$) Positive lookahead, ensuring that either CO or the end of the line follows

Explore the regex demo here

Steps to obtain the index of a regex match for every occurrence

Answer №1

Answer №2

Answer №3

Answer №4

Similar questions

Optimizing Angular for requireJS deletion

Steps for generating a unique division element for every javascript response

Creating an installation package for an Electron application on Windows

The markers are refusing to appear on the map, despite the fact that the data is successfully being retrieved from

What is the best way to align my clip-path's text with the center of the viewport and ensure that all of the clip-path's text is visible?

Using Node.js to dynamically load HTML content

Is there a way to determine my position in the cycle of WebGL/THREE radians that range from 0 to 1.57, then back to 0, and down to -1.57?

Encountering issues with loading JavaScript file in Reactjs

Error: Unable to establish connection to server with docker-compose due to MongoError

JavaScript and JSON interchangeably, the first AJAX response should be rewritten by the second response

What is the process for importing css and js files in laravel-webpack when utilizing a newly installed package through composer?

Having trouble with Vue's $route.push method not working when invoked from a method?

Is it possible to modify the contents within the JSP div tag without replacing them through an AJAX call?

Modify an HTML table and record any modifications as POST requests using Javascript

When attempting to browse for image files, Postman fails to display images

Struggling to integrate data retrieved from a Vue.js API

Create a page turning effect in React that simulates scrolling a certain amount at a time

Oh no! "The accuracy of your BMI calculation is in question."

"Are you familiar with delving into the intricacies of this

The characteristics that define an object as a writable stream in nodejs