JavaScript: Clone a given regular expression

JavaScript fundamental (ES6 Syntax): Exercise-63 with Solution

Clone Regular Expression

Write a JavaScript program to clone a given regular expression.

• Use new RegExp(), RegExp.prototype.source and RegExp.prototype.flags to clone the given regular expression.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2
// Define a function 'cloneRegExp' to create a clone of a regular expression.
const cloneRegExp = regExp => new RegExp(regExp.source, regExp.flags);

// Define a regular expression.
const regExp = /lorem ipsum/gi;
console.log(regExp); // Output the original regular expression.

// Create a clone of the original regular expression using 'cloneRegExp'.
const regExp2 = cloneRegExp(regExp);
console.log(regExp2); // Output the cloned regular expression.

Output:

{}
{}

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-63-1 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that creates an exact clone of a given regular expression, preserving its flags.
• Write a JavaScript function that accepts a regex and returns a new RegExp object with the same pattern and modifiers.
• Write a JavaScript program that duplicates a regular expression and tests both the original and the clone for equivalence.

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