\o{}, \000 character whose ordinal is the given octal number
\l lowercase next char (think vi)
\u uppercase next char (think vi)
- \L lowercase till \E (think vi)
- \U uppercase till \E (think vi)
- \Q quote (disable) pattern metacharacters till \E
+ \L lowercase until \E (think vi)
+ \U uppercase until \E (think vi)
+ \Q quote (disable) pattern metacharacters until \E
\E end either case modification or quoted section, think vi
Details are in L<perlop/Quote and Quote-like Operators>.