init_parsers

# File lib/csv.rb, line 2036
  def init_parsers(options)
    # store the parser behaviors
    @skip_blanks      = options.delete(:skip_blanks)
    @field_size_limit = options.delete(:field_size_limit)
    
    # prebuild Regexps for faster parsing
    esc_col_sep = escape_re(@col_sep)
    esc_row_sep = escape_re(@row_sep)
    esc_quote   = escape_re(@quote_char)
    @parsers = {
      # for empty leading fields
      leading_fields: encode_re("\\A(?:", esc_col_sep, ")+"),
      # The Primary Parser
      csv_row:        encode_re(
        "\\G(?:\\A|", esc_col_sep, ")",                # anchor the match
        "(?:", esc_quote,                              # find quoted fields
               "((?>[^", esc_quote, "]*)",             # "unrolling the loop"
               "(?>", esc_quote * 2,                   # double for escaping
               "[^", esc_quote, "]*)*)",
               esc_quote,
               "|",                                    # ... or ...
               "([^", esc_quote, esc_col_sep, "]*))",  # unquoted fields
        "(?=", esc_col_sep, "|\\z)"                    # ensure field is ended
      ),
      # a test for unescaped quotes
      bad_field:      encode_re(
        "\\A", esc_col_sep, "?",                   # an optional comma
        "(?:", esc_quote,                          # a quoted field
               "(?>[^", esc_quote, "]*)",          # "unrolling the loop"
               "(?>", esc_quote * 2,               # double for escaping
               "[^", esc_quote, "]*)*",
               esc_quote,                          # the closing quote
               "[^", esc_quote, "]",               # an extra character
               "|",                                # ... or ...
               "[^", esc_quote, esc_col_sep, "]+", # an unquoted field
               esc_quote, ")"                      # an extra quote
      ),
      # safer than chomp!()
      line_end:       encode_re(esc_row_sep, "\\z"),
      # illegal unquoted characters
      return_newline: encode_str("\r\n")
    }
  end