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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


In JavaScript, you can find the position of a matched string within a larger string using the search() method in conjunction with regular expressions. The search() method returns the index of the first occurrence of the matched substring in the string, or it returns -1 if no match is found. Here's how to use it:

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

const position = inputString.search(searchString);

if (position !== -1) {
  console.log(`The first occurrence of "${searchString}" starts at index ${position}.`);
} else {
  console.log(`"${searchString}" was not found in the input string.`);
}

In this example, we use the search() method to search for the string "cats" within the inputString. If a match is found, the position variable will contain the index where the first occurrence of "cats" starts in the string. If no match is found, position will be -1.

Keep in mind that the search() method works with plain strings, so it doesn't use regular expressions by default. If you want to use a regular expression for more complex pattern matching, you can modify the code like this:

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

const

In this example, we use a regular expression to search for "cats" globally (/cats/g) and then access the index property of the match object to find the starting position of the matched substring.

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