JavaScript Regular Expression Replace Except First And Last

I want to write a regular expression in JavaScript . So string can be replaced but except first and last one. e.g. str=''Marys' Home'' I want regular expression in JavaScript so

Solution 1:

You can use this:

var str = "'Marys' Home'";

var result = str.replace(/(?!^)(')(?!$)/g, '\\$1');
//=> 'Marys\' Home'

RegEx Demo

Solution 2:

var str = "'Marys' Home'"

function replace(str, pattern, replacement) {

  var firstIndex = str.indexOf(pattern)
    , lastIndex = str.lastIndexOf(pattern)
    , re = new RegExp(pattern, 'g')

  if (firstIndex < lastIndex) 
    str = str.substr(firstIndex + pattern.length, lastIndex)

  return str.replace(re, replacement)
}

console.log(replace(str, "'", "\'"))

Something like this you are looking for?