Next, we'll take a look at regular expressions. Regular Expression as the Search Expression (Single Match) As you can see, the replace() method returned the string 'TechOnTheNet is the best'. In this example, the replace() method performs a search for the first occurrence of the string 'great' and replaces it with the string 'the best'. The following will be output to the web browser console log: TechOnTheNet is the best We have written the output of the replace() method to the web browser console log, for demonstration purposes, to show what the replace() method returns. We have then invoked the replace() method of the totn_string to find and replace the first occurrence or match. In this example, we have declared a variable called totn_string that is assigned the string value of 'TechOnTheNet is great'. This method does not involve regular expression objects.įor example: var totn_string = 'TechOnTheNet is great' Ĭonsole.log(totn_string.replace('great', 'the best')) The simplest way to use the replace() method is to find and replace one string with another string. Let's take a look at an example of how to use the replace() method in JavaScript. Used to insert the string to the left of the matched substring Used to insert the string to the right of the matched substring Used to insert the substring from the last parenthesized match Used to insert the substring from a parenthesized match. Here are the ways that you can use the $ character: Value The $ character is a special character that is used in the replacement string to indicate that the value from the pattern match can be used as part of the replacement string. It is the replacement string or a function ( that returns a replacement string). Matches the preceding pattern at least n times, but not more than m times. Matches the preceding pattern at least n times. Matches the preceding pattern zero or one occurrence. Matches the preceding pattern one or more occurrences. Matches the preceding pattern zero or more occurrences. Matches one collation element that can be more than one character. Matches the nth subexpression found within ( ) before encountering \n. Matches at least m times, but no more than n times. Used to group expressions as a subexpression. Used to specify a nonmatching list where you are trying to match any character except for the ones in the list. Used to specify a matching list where you are trying to match any one of the characters in the list. Used like an "OR" to specify more than one alternative. If used with a match_parameter of 'm', it matches the end of a line anywhere within expression. If used with a match_parameter of 'm', it matches the start of a line anywhere within expression. As a RegExp object, it can be a combination of the following: Value It is either a string value or a RegExp object that will be searched for in string. In JavaScript, the syntax for the replace() method is: string.replace(search_expression, replacement) Parameters or Arguments search_expression
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