Question

How to extract a file name from a path, replace whitespaces, and make it lowercase using RegEx in JavaScript

Answer 1

// Extract only the file name.
// Replace File name with lowercase.
// Replace whitespaces with underscores.

let filename = "c:\\path\\to\\file\\WITH Whitespace1 and Whitespace2.js";

filename = filename.replace(/^.*[\\\/]([^\\\/]*)$/i,"$1");
filename = filename.replace(/\s/g,"_");
filename = filename.toLowerCase();

console.log(filename);

 
 
/*
run:
 
with_whitespace1_and_whitespace2.js
 
*/

 

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Answer 2

function normalizeFilename(filePath) {
  // Extract only the file name
  let filename = filePath.replace(/^.*[\\\/]([^\\\/]*)$/i, "$1");

  // Replace whitespaces with underscores
  filename = filename.replace(/\s/g, "_");

  // Convert to lowercase
  filename = filename.toLowerCase();

  return filename;
}

const filePath = "c:\\path\\to\\file\\WITH Whitespace1 and Whitespace2.js";
const result = normalizeFilename(filePath);

console.log(result); 

 
 
/*
run:
 
with_whitespace1_and_whitespace2.js
 
*/

 

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