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[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] race conditions  rad2deg( )  radians, vs. degrees  radiobuttons  rand( )  2nd  random     email signatures      lines in files         ordering of          selecting      numbers          biasing          generating      random-access files, updating      random-access I/O      randomizing arrays  Range header  raw I/O layer  2nd  read( )     fixed-length records  2nd      I/O layers      random-access files  readdir( )      globbing  reading     files  [See file access file contents]     records          with pattern separators      Usenet messages  reading and writing     determining whether data can be read or written      hash records to text files      RSS files  records      binary tree structures      closures as objects      comma-separated  [See CSV]     constructing      counting in files      fixed-length          reading      lastlog file      random-access I/O      reading          with pattern separators      reading and writing to text files      variable-length      wtmp file  recursively processing files in directories  recv( ), TCP, communicating over  redirect( )  ref( )  2nd  references      anonymous data      to arrays      arrays of scalar references      autovivification      closures as objects      to functions      as hash keys      as hash values      to hashes      hashes of arrays  2nd      iterating over arrays by      to methods      to packages, indirect      passing arrays and hashes by      reference count      returning subroutines by      to scalars      self-referential structures      symbolic  2nd      typed      weak, coping with circular data structures using  Regexp::Common module  2nd  register_function( )  regular expressions      \G anchor      backtracking  2nd      checking strings for valid numbers      commas in numbers      commenting      copying and substituting      doubled words      eager matching      email addresses      extracting ranges of lines      fuzzy matching      globbing filenames      greedy vs. non-greedy matching  2nd      honoring locale settings      logical functionality in      matching         abbreviations          letters          within multiple lines          nested patterns          Nth occurrence          shell globs as          from where last pattern ended          words      parsing HTML      pattern-matching modifiers          Boolean connectives      progressive matching      tcgrep program      testing for invalid patterns      urlify program      useful, list of  RelaxNG schema  rename script, example  rename( )      modifying files with temporary files  rep program  report( ), processing server logs  Representational State Transfer (REST)  require operator  2nd      trapping errors in  Resize( ), thumbnailing images  REST (Representational State Transfer)  restarting servers on demand  retrieve( )  return context, subroutines  return statement  return values, subroutines     returning by reference      returning failure      skipping selected  reverse( )  2nd      inverting hashes  reversing     array elements      hashes      words or characters in strings  revhash_demo program  revnum( )  rewinddir( )  rfrm program  Rich Site Summary  [See RSS] right angle bracket (>), file-access modes  2nd  rmdir( )  rmtree( )  robots for Web traversal  rollback( )  Roman module  Roman numerals  roman( )  rounding floating-point numbers  RSS (Rich Site Summary)      files, reading and writing  runtime     loading modules at      scoping

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