String manipulation

The following functions perform string manipulation.

Table 1. String manipulation
Function	Description
concat	Concatenate strings with delimiters
explode	Split a string based on delimiters
length	Get the length of a string
lpad	Left pad a string
pairs	Serialize a list of attributes to a string
rpad	Right pad a string
randstr	Return a random string based on input format
tolower	Convert the input string to lowercase.
toupper	Convert the input string to uppercase