CoffeeScript String - replace() method

Quiz

Description

This method finds a match between a regular expression and a string, and replaces the matched substring with a new substring.

The replacement string can include the following special replacement patterns −

Pattern	Inserts
$$	Inserts a "$".
$&	Inserts the matched substring.
$`	Inserts the portion of the string that precedes the matched substring.
$'	Inserts the portion of the string that follows the matched substring.
$n or $nn	Where n or nn are decimal digits, inserts the nth parenthesized submatch string, provided the first argument was a RegExp object.

Syntax

Given below is the syntax of replace() method of JavaScript. We can use the same method from the CoffeeScript code.

string.replace(regexp/substr, newSubStr/function[, flags]);

This method accepts various arguments as follows −

regexp - A RegExp object. The match is replaced by the return value of parameter #2.
substr - A String that is to be replaced by newSubStr.
newSubStr - The String that replaces the substring received from parameter #1.
function - A function to be invoked to create the new substring.
flags - A String containing any combination of the RegExp flags: g - global match, i - ignore case, m - match over multiple lines. This parameter is only used if the first parameter is a string.

Example

The following example demonstrates the usage of replace() method of JavaScript in CoffeScript code. Save this code in a file with name string_replace.coffee

re = /apples/gi
str = "Apples are round, and apples are juicy."

newstr = str.replace re, "oranges"
         
console.log newstr

Open the command prompt and compile the .coffee file as shown below.

c:\> coffee -c string_replace.coffee

On compiling, it gives you the following JavaScript.

// Generated by CoffeeScript 1.10.0
(function() {
  var newstr, re, str;

  re = /apples/gi;

  str = "Apples are round, and apples are juicy.";

  newstr = str.replace(re, "oranges");

  console.log(newstr);

}).call(this);

Now, open the command prompt again and run the CoffeeScript file as shown below.

c:\> coffee string_replace.coffee

On executing, the CoffeeScript file produces the following output.

oranges are round, and oranges are juicy.

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