​

​

// 1. replace letters a to c by an empty string

console.log("1. " + "Test abc test test abc test test".replace(/[a-c]/g, '') );

​

// replace letters that are NOT a to c by an empty string (notice the ^ sign)

console.log("2. " + "Test abc test test abc test test".replace(/[^a-c]/g, '') );

​

​

// replace letters that are NOT a to c by an empty string

// now the empty string is returned by a function

console.log("3. " + "Test abc test test abc test test".replace(/[^a-c]/g, function(){

  return '';

}) );

​

// replace letters that are NOT a to c by an empty string

// now the function has a param

console.log("4. " + "Test abc test test abc test test".replace(/[^a-c]/g, function(a){

  return '';

}) );

​

// replace letters that are NOT a to c by an empty string (now the function as a param)

// now the function outputs its param

// note that the final result is outputed after

console.log("5. " + "Test abc test test abc test test".replace(/[^a-c]/g, function(a){

  console.log("inside function: " + a);

  return '';

}) );

​

​

​

​

​

/*

 * [1] Selects all characters that are not between \u0000 and \u007E,

 *     those that are NOT basic latin characters, basic latin characters

 *     do NOT have accents, see en.wikipedia.org/wiki/Diacritic 

 *

 * [2] For each character of the string, map the character (that potentially has 

 *     an accent) to a non-accent character. If no match is found, simply return

 *     the original character.

 *

 */

function removeDiacritics (str) {

  return str.replace(/[^\u0000-\u007E]/g /* [1] */, function(a){  

    return diacriticsMap[a] || a; /* [2] */

  });

}

​