Pattern
A regexp-like1 string used by the Lua functions
string.findstring.matchstring.gmatchstring.gsub
defined as
| where | ^ | 
matches the beginning of the string, | 
$ | 
matches the end of the string, and | |
RECURSIVE-ITEM | 
is the recursive item. | 
Footnotes:
1 
Due to its small size, Lua does not use POSIX regular expressions.