Extract specific text from a string using TypeScript

Question

Extract specific text from a string using TypeScript

I have a specific text format that goes like this:

test/something

The test/ part always remains the same, but the word following it varies. I am trying to extract the word after test/, which is essentially what I need. Sometimes, this pattern appears within a sentence, such as:

Please grab the word after test/something thank you

.

In this scenario, I only want to capture something, not the additional words like thank you.

I came up with this code:

const start = text.indexOf('test/');
const end = text.substring(start).indexOf(' ') + start;
const result = text.substring(start, end).replace('test/', '');

This solution works when the pattern is surrounded by spaces in a sentence. How can I modify it to handle all cases, even if the input string consists solely of test/something without any other characters before or after it?

javascript string

Answer 1

Answer №1

Instead of using a regular expression, I would suggest utilizing a different approach. Start by locating the string "test/", then capture everything that is not a space following it and retrieve this captured group.

const text = 'Please grab the word after test/something thank you';
const word = text.match(/test\/(\S+)/)?.[1];
console.log(word);

If you are working in a modern environment, there is an easier way to find the word following "test/" without the need for capturing groups.

const text = 'Please grab the word after test/something thank you';
const word = text.match(/(?<=test\/)\S+/)?.[0];
console.log(word);

Answer 2

Instead of using a regular expression, I would suggest utilizing a different approach. Start by locating the string "test/", then capture everything that is not a space following it and retrieve this captured group.

const text = 'Please grab the word after test/something thank you';
const word = text.match(/test\/(\S+)/)?.[1];
console.log(word);

If you are working in a modern environment, there is an easier way to find the word following "test/" without the need for capturing groups.

const text = 'Please grab the word after test/something thank you';
const word = text.match(/(?<=test\/)\S+/)?.[0];
console.log(word);

Answer 3

Answer №2

To achieve the desired outcome, you can utilize a regular expression that employs a positive lookbehind ((?<=...)). This regex will capture non-greedily anything (.+?) up to the first word boundary (\b):

const extract = (s) => s.match(/(?<=test\/).+?\b/);

console.log(extract('test/something'));
console.log(extract('Kindly fetch the word following test/something. Thank you.'));

Answer 4

To achieve the desired outcome, you can utilize a regular expression that employs a positive lookbehind ((?<=...)). This regex will capture non-greedily anything (.+?) up to the first word boundary (\b):

const extract = (s) => s.match(/(?<=test\/).+?\b/);

console.log(extract('test/something'));
console.log(extract('Kindly fetch the word following test/something. Thank you.'));

Extract specific text from a string using TypeScript

Answer №1

Answer №2

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