Search for	Example	Results
A single word	`cat`	Topics that contain the word "cat". You will also find its grammatical variations, such as "cats".
A phrase. You can specify that the search results contain a specific phrase.	`"cat food"` (quotation marks)	Topics that contain the literal phrase "cat food" and all its grammatical variations. Without the quotation marks, the query is equivalent to specifying an OR operator, which finds topics with one of the individual words instead of the phrase.

Search for	Operator	Example
Two or more words in the same topic	`AND` `and` `+` (plus symbol) `&` (ampersand)	`cat AND dog` `"cat food"+milk` `"cat food"&"dog food"`
Either word in a topic	`OR` `or` `\|` (pipe)	`cat OR dog` `cat \| dog`
Topics that do not contain a specific word or phrase	`NOT` `not` `!` (exclamation point)	`NOT cat` `! dog`
Topics that contain one string and do not contain another	`^` (caret)	`cat ^ mouse`
A combination of search types	`( )` parentheses	`cat + (dog \| mouse)` `cat \| dog + (! mouse)`

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Develop > Programming Guide > System Language reference > List: RAD functions > RAD function: substrb

RAD function: substrb

A RAD function that extracts a substring from a multibyte character or binary string.

Function

substrb

Format

substrb(string, beginning position, length)

Parameters

The following parameters are valid for the substr function:

Parameter	Data type	Description
string	String	The string being modified.
beginning position	Number	The position in the string where the substring is to begin.
length	Number	The total number of bytes you want the substring to contain. The default behavior is to include all remaining bytes in the string from the starting position. You can use the length parameter to specify a shorter byte length. Caution You should choose a length value that takes into account the number of bytes available in the source string. If you choose too low a value the substituted string may contain corrupted data because the function did not have enough bytes to substitute a multibyte character. Refer to a UTF-8 or UTF-16 character encoding map to see how many bytes a particular multibyte character requires. It is recommended that you only use this function on strings of a fixed byte length to avoid possible data corruption. If you want to replace a fixed number of characters use the substr function instead.

Example

$a=substrb("abcÄÖÜdef", 5)
$b=substrb("abcÄÖÜdef", 1, 7)

After execution, the value of $a is ÖÜdef and the value of $b is abcÄÖ.

For the string $b, setting the length value to 4 or 6 would lead to data corruption because there are not enough bytes available to contain the multi-byte characters Ä and Ö respectively.

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