Javascript Assignment Help : JavaScript Regular Expressions

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What Is a Regular Expression?


A regular expression is a sequence of characters that forms a search pattern.

When you search for data in a text, you can use this search pattern to describe what you are searching for.

A regular expression can be a single character, or a more complicated pattern.

Regular expressions can be used to perform all types of text search and text replace operations.


A regular expression is a sequence of characters that forms a search pattern.

The search pattern can be used for text search and text replace operations.


Regular expressions are patterns used to match character combinations in strings. In JavaScript, regular expressions are also objects. These patterns are used with the execand test methods of RegExp, and with the matchmatchAll, replacesearch, and split methods of String. This chapter describes JavaScript regular expressions.


Syntax


/pattern/modifiers;


Example:


var pattern = /codersarts/i;


Example explained:


/codersarts/i  is a regular expression.

codersarts  is a pattern (to be used in a search).

i  is a modifier (modifies the search to be case-insensitive).



Using String Methods


In JavaScript, regular expressions are often used with the two string methods: search() and replace().


The search() method uses an expression to search for a match, and returns the position of the match.

The replace() method returns a modified string where the pattern is replaced.



Using String search() With a String

The search() method searches a string for a specified value and returns the position of the match:


Example


Use a string to do a search for "Codersarts" in a string:

var str = "Codersarts Javascript assignment Services"; var n = str.search("Codersarts");



Using String search() With a Regular Expression


Example

Use a regular expression to do a case-insensitive search for "Codersarts" in a string:


var str = "Codersarts Javascript assignment Services"; var n = str.search(/Codersarts/i);


Search a string for "Codersarts", and display the position of the match:

34


The result in n will be:

34


Using String replace() With a String


The replace() method replaces a specified value with another value in a string:

var str = "Codersarts Javascript assignment Services"; var res = str.replace("Codersarts", "sofstack");


Use String replace() With a Regular Expression


Example

Use a case insensitive regular expression to replace Codersarts with sofstack in a string:

var str = "Codersarts Javascript assignment Services";

var res = str.replace(/Codersarts/i, "sofstack");


The result in res will be:

sofstack Javascript assignment Services;


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