strextract/4—retrieve a string of a specified length that begins at a  specified position within a larger string

The strextract/4 function retrieves a string of a specified length that begins at a specified position within a larger string. The general syntax for this function is as follows: 

strextract($STR,$POS,$LEN,$NEWSTR)
$NEWSTR=strextract($STR,$POS,$LEN)

strextract/4 arguments

Argument

Mode

Type

Description

$STR

Input

STRING

Specifies the base string within which you want to retrieve another, partial, string that starts at $POS

$POS

Input

INTEGER

Specifies the starting position for the partial string that you want to return

$LEN

Input

INTEGER

Specifies the length (number of characters) of the partial string that you want to return

$NEWSTR

Output

STRING

Retrieved string

Use the strextract/4 function to return part of the string specified in the $STR argument into $NEWSTR. The returned part of the string starts at character position $POS and is $LEN characters long.

The $POS is determined by counting 1 as the first character of the string specified in $STR.

strextract/4 example

strextract($YYYYMMDD,5,2,$MM);

 

Tip: For faster searching, add an asterisk to the end of your partial query. Example: cert*