String manipulation

The following functions perform string manipulation.

Table 1. String manipulation
Function	Description
concat	Concatenate strings with delimiters
split	Split a string based on delimiters
length	Returns the size of the string (strlen)
lpad	Left pad a string
rpad	Right pad a string
rand	Return a random string based on input format
lower	Convert the input string to lowercase.
upper	Convert the input string to uppercase