Exploring text with regex that begins with a particular pattern

Question

Exploring text with regex that begins with a particular pattern

I'm on a mission to find specific keywords within text.

const matchHashtags = /(#\w+) ?/g;
const text ="this is #sample tag and other #another tag";
while ((hashtag = matchHashtags.exec(text))) {
      alert(hashtag);
}

Above, we successfully searched for words starting with #. Now, let's try finding words starting with "iphone~" below.

const matchHashtags2 = /(^|\s)\iphone~(\w+)/g;
const text2 ="I have iphone~seven~new and iphone~seven~ old phones";
while ((hashtag2 = matchHashtags2.exec(text2))) {
      alert(hashtag2);
}

I expect this query to find "iphone~seven" including the word after it. However, it returns: "iphone~seven, ,seven".

https://jsfiddle.net/gecj54a3/1/

Please help me resolve this issue. Thank you!

javascript angular regex typescript

Answer 1

Answer №1

Is there an issue with the regular expression

const matchHashtags2 = /(iphone~\w+) ?/g;

?

Answer 2

Is there an issue with the regular expression

const matchHashtags2 = /(iphone~\w+) ?/g;

?

Answer 3

Answer №2

This is one way you could approach it:

let sentence = 'I own two cats, three dogs, and four birds';
let words = sentence.split(' ');
for (let j = 0; j < words.length; j++){
    if(words[j].includes(',')){
        console.log(words[j]);
    }
}

Answer 4

This is one way you could approach it:

let sentence = 'I own two cats, three dogs, and four birds';
let words = sentence.split(' ');
for (let j = 0; j < words.length; j++){
    if(words[j].includes(',')){
        console.log(words[j]);
    }
}

Answer 5

Answer №3

Here's a helpful code snippet for extracting specific hashtags:

const hashtagPattern = /(^|\s)\iphone~(\w+)/g;
const text = "I have iphone~seven~new and iphone~seven~ old phones";
while ((hashtag = hashtagPattern.exec(text))) {
      alert(hashtag[2]); // Here we are accessing the matched hashtag
}

Answer 6

Here's a helpful code snippet for extracting specific hashtags:

const hashtagPattern = /(^|\s)\iphone~(\w+)/g;
const text = "I have iphone~seven~new and iphone~seven~ old phones";
while ((hashtag = hashtagPattern.exec(text))) {
      alert(hashtag[2]); // Here we are accessing the matched hashtag
}

Answer 7

Answer №4

The alert gives that result because of the use of a capture group in your code.

Remember, there is no need for an extra set of parenthesis in the while loop and you don't have to escape \i in the pattern to match an i character.

By using (^|\s), any leading space will be included in the match. To avoid this, make it a non-capture group and use a separate capture group for the desired content.

You can then use console.log to view the value of group 1.

const matchHashtags2 = /(?:^|\s)(iphone~\w+)/g;
const text2 = "I have iphone~seven~new and iphone~seven~ old phones";
let hashtag2;
while (hashtag2 = matchHashtags2.exec(text2)) {
  console.log(hashtag2[1]);
}

Alternatively, you can utilize match without a capture group, along with the global flag /g preceded by a word boundary \b if that fits your matching criteria.

const matchHashtags2 = /\biphone~\w+/g;
const text2 = "I have iphone~seven~new and iphone~seven~ old phones";
console.log(text2.match(matchHashtags2));

Answer 8

The alert gives that result because of the use of a capture group in your code.

Remember, there is no need for an extra set of parenthesis in the while loop and you don't have to escape \i in the pattern to match an i character.

By using (^|\s), any leading space will be included in the match. To avoid this, make it a non-capture group and use a separate capture group for the desired content.

You can then use console.log to view the value of group 1.

const matchHashtags2 = /(?:^|\s)(iphone~\w+)/g;
const text2 = "I have iphone~seven~new and iphone~seven~ old phones";
let hashtag2;
while (hashtag2 = matchHashtags2.exec(text2)) {
  console.log(hashtag2[1]);
}

Alternatively, you can utilize match without a capture group, along with the global flag /g preceded by a word boundary \b if that fits your matching criteria.

const matchHashtags2 = /\biphone~\w+/g;
const text2 = "I have iphone~seven~new and iphone~seven~ old phones";
console.log(text2.match(matchHashtags2));

Exploring text with regex that begins with a particular pattern

Answer №1

Answer №2

Answer №3

Answer №4

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