Core Function SubStr
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| − | SubStr( <expression>, <start>, < | + | SubStr( <expression>, <start>, <count>, <replacement> ) |
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If count is given and is negative, then that many characters will be omitted from the end of string (after the start position has been calculated when a start is negative). If start denotes the position of this truncation or beyond, empty string will be returned. | If count is given and is negative, then that many characters will be omitted from the end of string (after the start position has been calculated when a start is negative). If start denotes the position of this truncation or beyond, empty string will be returned. | ||
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| + | (Note - If you wish to extract from a start to a end position instead of from start to a number of characters you should see Sub()) | ||
==== replacement ==== | ==== replacement ==== | ||
Optional; If you set this parameter the substring will be replaced instead of returned so you will receive a new string with the substring replaced with the replacement text. | Optional; If you set this parameter the substring will be replaced instead of returned so you will receive a new string with the substring replaced with the replacement text. | ||
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=== Return Value === | === Return Value === | ||
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# Prints | # Prints | ||
# UberFoX! | # UberFoX! | ||
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Latest revision as of 12:38, 14 June 2015
SubStr( <expression>, <start>, <count>, <replacement> )
Contents |
Description
Return part of a string
Parameters
expression
The expression to evaluate.
start
The character position to start. (0 = first character)
OR
If the start is a negative value the character position will work backwards from the length of the string.
count
Optional; The number of characters to extract. By default the entire remainder of the string.
If count is given and is negative, then that many characters will be omitted from the end of string (after the start position has been calculated when a start is negative). If start denotes the position of this truncation or beyond, empty string will be returned.
(Note - If you wish to extract from a start to a end position instead of from start to a number of characters you should see Sub())
replacement
Optional; If you set this parameter the substring will be replaced instead of returned so you will receive a new string with the substring replaced with the replacement text.
Return Value
Success: Returns the extracted string.
Failure: Returns an empty string.
Remarks
None.
Example
$var = Substr("I am a string", 2, 2); MsgBox("2 chars extracted from position 2 are: $var");
Example using Start as a negative number
say substr("UberFoX", -3); // Prints FoX say substr("UberFoX", -4, 2); // Prints rF
Using replacement and returning a new string
$str = "UberCat!"; print substr($str, 4, 3, "FoX"); # Prints # UberFoX!
Example of using an array as the second param
my $str = "the quick brown fox"; my $needle = "quick"; my $start = strpos($str, $needle); my $len = strlen($needle); my $arr = array($start, $len); say substr($str, $arr); // Prints "quick" # Slghtly better than doing substr($str, $arr[0], $arr[1]);
