strnpart/4—determine the start position of a specified occurrence of a part of a string

The strnpart/4 function  determines the start position of a specified occurrence of a  part of a string. The syntax for this function is as follows:

strnpart($STR,$PART,$CNT,$POS)
$POS=strnpart($STR,$PART,$CNT)

strnpart/4 arguments

Use the strnpart/4 function to determine at what position in $STR the number of occurrences for the partial string $PART reaches $CNT number of occurrences. The position is returned in $POS.

The first character of the string is counted as 1. If the partial string does not occur at least $CNT times in the base string, the value 0 is returned as position.

strnpart/4 example

$HLEN = len($E.mc_host);
$ZPOS = strnpart($E.mc_host,'.',2);
if ( $HLEN == 0 OR $ZPOS == 0 OR $ZPOS == $HLEN ) then
	$E.mc_location = "Unknown";
else
		$E.mc_location = substring($E.mc_host,$ZPOS,$HLEN-$ZPOS);