Looking to find a way to identify strings with hyphens in JavaScript?

Question

Looking to find a way to identify strings with hyphens in JavaScript?

I am trying to extract specific parts of a URL that follow a certain pattern like the one below:

http://example.com/somepath/this-is-composed-of-hypens-3144/someotherpath

Specifically, I am interested in extracting the portion of the URL that consists of hyphens and ends with numbers. In the given example URL, I want to extract this-is-composed-of-hypens-3144. My current approach involves using the regex pattern below:

const re = /[a-z]*-[a-z]*-[0-9]*/gis;
const match = re.exec(url);
return (match && match.length) ? match[0] : null;

However, this approach only works if there are two hyphens in the URL. In reality, the number of hyphens can vary. How can I modify my regex pattern to accommodate URLs with a variable number of hyphens?

javascript regex

Answer 1

Answer №1

Feel free to utilize

/\/([a-z]+(?:-[a-z]+)*-[0-9]+)(?:\/|$)/i

Check out the regex demonstration

Specifics

\/ - signifies a / character
([a-z]+(?:-[a-z]*)*-[0-9]+) - Group 1 capturing:
- [a-z]+ - 1 or more ASCII letters
- (?:-[a-z]+)* - 0 or more instances of - followed by 1 or more ASCII letters
(?:\/|$) - either / or end of the string.

If there can be any word characters, not just ASCII letters, you can substitute each [a-z] with \w.

var s = "http://example.com/somepath/this-is-composed-of-hypens-3144/someotherpath";
var m = s.match(/\/([a-z]+(?:-[a-z]+)*-[0-9]+)(?:\/|$)/i);
if (m) {
  console.log(m[1]);
}

Answer 2

Feel free to utilize

/\/([a-z]+(?:-[a-z]+)*-[0-9]+)(?:\/|$)/i

Check out the regex demonstration

Specifics

\/ - signifies a / character
([a-z]+(?:-[a-z]*)*-[0-9]+) - Group 1 capturing:
- [a-z]+ - 1 or more ASCII letters
- (?:-[a-z]+)* - 0 or more instances of - followed by 1 or more ASCII letters
(?:\/|$) - either / or end of the string.

If there can be any word characters, not just ASCII letters, you can substitute each [a-z] with \w.

var s = "http://example.com/somepath/this-is-composed-of-hypens-3144/someotherpath";
var m = s.match(/\/([a-z]+(?:-[a-z]+)*-[0-9]+)(?:\/|$)/i);
if (m) {
  console.log(m[1]);
}

Looking to find a way to identify strings with hyphens in JavaScript?

Answer №1

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