The use of Substring,substr,split in jquery

The substr () method extracts a specified number of characters from the start subscript in a string.

Grammar

stringobject. substr (start,length)

Parameters	Description
Start	Necessary. The starting subscript for the substring to extract. Must be numeric. If it is a negative number, the argument declares the position from the end of the string. That is,-1 refers to the last character in the string, 2 refers to the second-lowest character, and so on.
Length	Optional. The number of characters in the substring. Must be numeric. If this argument is omitted, then the string from the beginning of the Stringobject to the end is returned.

return value

A new string that contains the length characters starting at the start of the Stringobject , including the character that the start refers to. If lengthis not specified, the returned string contains the character from start to the end of stringobject .

Example 1

In this example, we will use SUBSTR () to extract some characters from the string:

<script type= "Text/javascript" >var str= "Hello world!" document.write ( str.substr(3) ) </script>

Output:

Lo world!

Example 2

In this example, we will use SUBSTR () to extract some characters from the string:

<script type= "Text/javascript" >var str= "Hello world!" document.write ( str.substr(3,7) ) </script>

Output:

Lo Worl

Substring method

Returns a substring at the specified position in a string object.

Strvariable.substring (start, end)

"String Literal". Substring (start, end)

Parameters

Start

Indicates the starting position of the substring, starting at 0.

End

Indicates the ending position of the substring, starting at 0.

Description

Method will return a string containing a substring from start to last (not including end).

The substring method uses the smaller values from start and end as the starting point for the substring. For example, strvar.substring (0, 3) and strvar.substring (3, 0) will return the same substring.

If start or end is NaN or negative, replace it with 0.

The length of the substring equals the absolute value of the difference between start and end. For example, the length of the substring returned in strvar.substring (0, 3) and strvar.substring (3, 0) is 3.

Example

The following example demonstrates the use of the substring method.

function Substringdemo () {

var SS; Declares a variable.

var s = "The rain in Spain falls mainly in the plain.";

SS = S.substring (12, 17); Takes a substring.

return (SS); Returns a substring.

}

Split method

Splits a string into substrings and returns the result as an array of strings.

Stringobj.split ([separator[, limit]])

Parameters

Stringobj

Required option. The String object or text to be decomposed. The object is not modified by the split method.

Separator

Options are available. A string or regular expression object that identifies whether one or more characters are used when separating the string. If this option is omitted, a single element array containing the entire string is returned.

Limit

Options are available. This value is used to limit the number of elements in the returned array.

Description

The result of the split method is an array of strings, which are decomposed in the stingobj where each occurrence of the separator occurs. Separator is not returned as part of any array element.

Example

The following example demonstrates the use of the split method.

function Splitdemo () {var s, SS;

var s = "The rain in Spain falls mainly in the plain.";

Decompose at each space character.

SS = S.split ("");

return (SS);

}