Saturday, 31 March 2012

Regex in JS

RegExp, is short for regular expression.

Complete RegExp Object Reference


The reference contains a brief description and examples of use for each property and method!

What is RegExp?

A regular expression is an object that describes a pattern of characters.
When you search in a text, you can use a pattern to describe what you are searching for.
A simple pattern can be one single character.
A more complicated pattern can consist of more characters, and can be used for parsing, format checking, substitution and more.
Regular expressions are used to perform powerful pattern-matching and "search-and-replace" functions on text.

Syntax

var patt=new RegExp(pattern,modifiers);

or more simply:

var patt=/pattern/modifiers;
  • pattern specifies the pattern of an expression
  • modifiers specify if a search should be global, case-sensitive, etc.

RegExp Modifiers

Modifiers are used to perform case-insensitive and global searches.
The i modifier is used to perform case-insensitive matching.
The g modifier is used to perform a global match (find all matches rather than stopping after the first match).

Example 1

Do a case-insensitive search for "w3schools" in a string:
var str="Visit W3Schools";
var patt1=/w3schools/i;
The marked text below shows where the expression gets a match:
Visit W3Schools


Example 2

Do a global search for "is":
var str="Is this all there is?";
var patt1=/is/g;
The marked text below shows where the expression gets a match:
Is this all there is?


Example 3

Do a global, case-insensitive search for "is":
var str="Is this all there is?";
var patt1=/is/gi;
The marked text below shows where the expression gets a match:
Is this all there is?



test()

The test() method searches a string for a specified value, and returns true or false, depending on the result.
The following example searches a string for the character "e":

Example

var patt1=new RegExp("e");
document.write(patt1.test("The best things in life are free"));
Since there is an "e" in the string, the output of the code above will be:
true




exec()

The exec() method searches a string for a specified value, and returns the text of the found value. If no match is found, it returns null.
The following example searches a string for the character "e":

Example 1

var patt1=new RegExp("e");
document.write(patt1.exec("The best things in life are free"));
Since there is an "e" in the string, the output of the code above will be:
e

No comments:

Post a Comment

What should you required to learn machine learning

  To learn machine learning, you will need to acquire a combination of technical skills and domain knowledge. Here are some of the things yo...