Returns the characters in a string in reverse order.
||A string or expression that evaluates to a string.
returns the characters in string
in reverse order. The string
can contain 8-bit characters or 16-bit Unicode characters. For further details on InterSystems IRIS Unicode support, refer to Unicode
in Using ObjectScript
does not recognize surrogate pairs. Surrogate pairs are used to represent some Chinese characters and to support the Japanese JIS2004 standard. You can use the $WISWIDE
function to determine if a string contains a surrogate pair. The $WREVERSE
function recognizes and correctly parses surrogate pairs. $REVERSE
are otherwise identical. However, because $REVERSE
is generally faster than $WREVERSE
is preferable for all cases where a surrogate pair is not likely to be encountered.
The following WRITE
commands shows the return value from $REVERSE
. The first returns CBA, the second returns 321.
You can use the $REVERSE
function with other functions to perform search operations from the end of the string. The following example demonstrates how you can use $REVERSE
with the $FIND
functions to locate the last example of a string within a line of text. It returns the position of that string as 33:
SET line="THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG."
WRITE "The last THE in the line begins at ",position