Tech Tip: Find position of the last occurrence of a substring in a string
PRODUCT: 4D | VERSION: 14.3 | PLATFORM: Mac & Win
Published On: December 12, 2014
Below is an utility method that uses the php function strrpos to find the position of the last occurrence of a substring in a string.
| // Method: Php_strrpos // Parameters // $1 - Source string to find pattern // $2 - pattern to search for // // Return // $0 - position of the last occurrence of the pattern // ---------------------------------------------------- C_TEXT($1;$2;$src;$pattern) C_LONGINT($result;$0) $src:=$1 $pattern:=$2 PHP Execute("";"strrpos";$result;$src;$pattern) If($result#0) $0:=$result+1 //needed because in php, string positions start at 0, not 1 Else $0:=0 //pattern not found End if |
Below is an example of finding the last occurrence of a pattern in a string:
| C_TEXT($src;$pattern) C_LONGINT($pos) $src:="test string test string" $pattern:="test" $pos:=Php_strrpos($src;$pattern) |
$pos will return 13, which is the position of the last occurrence of the substring "test".
ARRAY LONGINT($rxPositions;0)
ARRAY LONGINT($rxLengths;0)
$sourceText:="test string test string"
$rxPattern:="(?mi-s)(test)(?!.*test)"
$rxMatch:=Match regex($rxPattern;$sourceText;1;$rxPositions;$rxLengths)