Regular expression: Search for a particular word following the initial appearance of a backslash

I need help with creating a regex pattern to find the word "bacon" after the first "/" in a URL.

Here are some examples:

Expected to return true:

console.log('1 - ', myRegexFunction('www.bacondelivery.com/weekly-bacon-delivery/'));
console.log('2 - ', myRegexFunction('www.bacondelivery.com/daily-bacon-delivery/'));
console.log('3 - ', myRegexFunction('www.bacondelivery.com/bacon-of-the-month-club/'));

Expected to return false:

console.log('4 - ', myRegexFunction('www.bacondelivery.com/'));
console.log('5 - ', myRegexFunction('www.bacondelivery.com/?some_param'));
console.log('6 - ', myRegexFunction('www.bacondelivery.com/about/'));
console.log('7 - ', myRegexFunction('www.bacondelivery.com/contact-us/'));

This is what I currently have:

function myRegexFunction(url) {
  var regex = new RegExp("^([a-z0-9]{5,})$");
  if (regex.test(url)) {
      return true;
  } else {
      return false;
  }
}

Any suggestions would be greatly appreciated!

javascriptregexmatch

Answer №1

Here is a regex that can be used for this purpose:

^[^\/]+\/[^\/]*\bbacon\b.*

Check out the RegEx Demo for more details

RegEx Breakdown:

  • ^: Indicates the start of the text
  • [^\/]+: Matches one or more characters that are not a slash (/)
  • \/: Matches a slash (/)
  • [^\/]*: Matches zero or more characters that are not a slash (/)
  • \bbacon\b: Matches the complete word "bacon"
  • .*: Matches any remaining text on the same line

Code Example:

function checkUrlForBacon(url) {
  const regex = /^[^\/]+\/[^\/]*\bbacon\b.*/;
  return regex.test(url);
}

console.log('1 - ', checkUrlForBacon('www.bacondelivery.com/weekly-bacon-delivery/'));

console.log('2 - ', checkUrlForBacon('www.bacondelivery.com/daily-bacon-delivery/'));
console.log('3 - ', checkUrlForBacon('www.bacondelivery.com/bacon-of-the-month-club/'));

console.log('4 - ', checkUrlForBacon('www.bacondelivery.com/'));
console.log('5 - ', checkUrlForBacon('www.bacondelivery.com/?some_param'));
console.log('6 - ', checkUrlForBacon('www.bacondelivery.com/about/'));
console.log('7 - ', checkUrlForBacon('www.bacondelivery.com/contact-us/'));

Answer №2

Consider trying out this regular expression pattern:

\/.*\bbacon\b

When this pattern produces a match, it indicates the presence of the specified word in the URL. To perform a case-insensitive match, you can utilize the 'i' modifier.

Here's a breakdown of the regex components:

  • \/: denotes a slash
  • .*: represents any character
  • \bbacon\b: indicates the target word enclosed within word boundaries

Feel free to explore a demonstration of this regex here.

UPDATE: For a more specific match for the term "bacon" after the initial occurrence, please refer to anubhava's solution mentioned in the thread.

Answer №3

Have you given this a shot?

/\/.*bacon/

Answer №4

If I had to choose a straightforward approach, I'd recommend using the following regex pattern: const regex = /\/.*(bacon)/

function checkForBacon(url) {
  var regex = /\/.*(bacon)/;
  if (regex.test(url)) {
      return true;
  } else {
      return false;
  }
}
  • \/ matches after a forward slash /
  • .* matches zero or more characters
  • (bacon) defines the pattern to search for (parentheses are optional)

Keep in mind that this regex may fail if your link is like http://baconurl/…

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