String library

The FortiADC OS supports only the Lua string library. All other libraries are disabled. The string library includes the following string-manipulation functions:

• string.byte(s, i)
• string.char(i1,i2…)
• string.dump(function)
• string.find(s, pattern)
• string.format
• string.gmatch
• string.gsub
• string.len
• string.lower
• string.match
• string.rep
• string.reverse
• string.sub
• string.upper
• string.starts_with
• string.ends_with

For example: uri:starts_with (b), uri:ends_with (b)

Note:

• If you want to do regular expression match, you can use string.match with Lua patterns.
• All relational operators >, <, >=, <=, ~=, == apply to strings. Especially, == can be used to test if one string equals to another string.
• string.find can be used to test whether one string contains another string.

For a tutorial on scripting with the Lua string library, see http://lua-users.org/wiki/StringLibraryTutorial.