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  1. or download this
    # match everything at once
@everything = /^\s*(\w+)\s*=\s*(\w+)(\s*,\s*\w+)?(\s*,\s*\w+)?(\s*,\s*
+\w+)?$/
  2. or download this
    # match the required part
/^\s*(\w+)\s*=\s*(\w+)/gc;
($keyword, $value) = ($1,$2);
# match the optional part
@optional = /\G\s*,\s*(\w+)/g;