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Utpal Vishwas

Utpal Vishwas

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I am Utpal Vishwas from Uttar Pradesh. Have completed my B. Tech. course from MNNIT campus Prayagraj in 2022. I have good knowledge of computer networking.

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1 Answers

Aryan Kumar

Aryan Kumar

02-Nov-2023

To find all matching strings using regular expressions (regex) in JavaScript, you can use the .match() method with the global (g) flag or use the .exec() method in a loop. Here are both approaches:

Using .match() with the global (g) flag:

The .match() method with the global flag will return an array of all matching strings found in the input string. Here's how to use it:

const inputString = "Hello, I have 3 cats and 2 dogs, but I want more cats.";

const regex = /\d+ cat/g; // Regular expression to match numbers followed by "cat"

const matches = inputString.match(regex);

console.log(matches); // Output: ["3 cat"]

In this example, the regular expression /d+ cat/g is used to match numbers followed by "cat" in the input string. The .match() method with the global flag (g) returns an array of all matching strings.

Using .exec() in a loop:

You can also use the .exec() method in a loop to find all matching strings one by one. Here's an example:

const inputString = "Hello, I have 3 cats and 2 dogs, but I want more cats.";
const regex = /\d+ cat/g; // Regular expression to match numbers followed by "cat"

let match;
const matches = [];

while ((match = regex.exec(inputString)) !== null) {
  matches.push(match[0]);
}

console.log(matches); // Output: ["3 cat"]

In this example, we use a while loop with the .exec() method to iterate through the input string and collect all matching strings in the matches array. The loop continues until no more matches are found.

Both approaches will help you find all matching strings in a given input string using regular expressions in JavaScript.

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