Index – R

race condition raise Python Ruby rand in one-liners random numbers range range pattern awk raster image as nested array raster library choosing rasterisation ray through a pixel ray-sphere intersection ray-triangle intersection Rayon re debug strict mode RE2 backreferences re (pragma) re.findall re.search re.sub re::install re::is_regexp re::optimization re::regexp_pattern re::regmust re::regname re::regnames re::regnames_count READ read buffered shell read (POSIX) read mode read-modify-write read-write mode read_history_range (Peta::ReadLine::XS) readback cost readdir, [1] READLINE readline, [1], [2], [3], [4], [5], [6], [7] readlink readonly (Scalar::Util) readpipe real real_import (Filter::Util::Call) record (Peta::FFI) recover (GDBM_File) recursion recursive pattern recursive subpattern captures depth limit recv sender address redirection shell redo reduce (List::Util) reduction, [1] reduction variable reductions (List::Util)

ref CODE testing for a reference REFCNT (B::SV) refcount (Peta::XS) reference, [1], [2], [3] common mistakes copying nested data, [1], [2], [3] passing to a subroutine stringification to a reused array reference counting regex regex engine choosing comparison regex optimiser first-character discrimination fixed-string check implicit anchoring minimum length simple repetition regexp replace substitute Tcl regexp_pattern (re) register (Hash::Util::FieldHash) regmust (re) regname (re) regnames (re) regnames_count (re) regsub regular expression as set of strings basics comments compile caching debugging extracting all matches grammar match preference rules matching principles modifiers multi-line matching optimisation tips other engines parsing phases, [1] performance Unicode whitespace relational operator, [1] release (Peta::FFI) remainder remap (File::Map) remquo (POSIX) rename render pass render pipeline render target, [1] offscreen canvas reorganize (GDBM_File) REPL, [1] replace require Lua PHP Ruby resampling reservoir sampling reset (Digest::MD5) (Digest::SHA) return, [1] return value reverse revolve rewinddir RGB hex notation RGBA ridged noise right shift right-handed coordinate system rindex rl_completion_matches (Peta::ReadLine::XS) rl_parse_and_bind (Peta::ReadLine::XS) rl_readline (Peta::ReadLine::XS) rmdir role requirements Role::Tiny, [1] Role::Tiny::With ROT13 rotation Euler angles versus quaternions Ruby common mistakes in Perl moving to Perl RubyGems