The predicates @char_is_xxx(s) returns true if all characters in s are in the class xxx. These classes are defined as follows:

  • alnum Any alphanumeric character
  • alpha Any alphabetic character
  • ascii Anay character between 0 and octal 0177 inclusive.
  • blank Any whitespace character that is not a line separator
  • cntrl Any control character
  • digit Any decimal digit
  • graph Any graphical character
  • lower Any lowercase character
  • print Any printable character
  • punct Any punctuation character
  • space Any whitespace character
  • upper Any uppercase character
  • xdigit Any hexadecimal digit character

See also String Management @car    @cdr    @char_is_alnum    @char_is_alpha    @char_is_ascii    @char_is_blank    @char_is_cntrl    @char_is_digit    @char_is_graph    @char_is_lower    @char_is_print    @char_is_punct    @char_is_space    @char_is_upper    @char_is_xdigit    @copy    @count    @drop    @dump    @dumpvar    @empty    @explode    @find    @is_prefix    @is_string    @is_subsequence    @is_suffix    @last    @member    @occurs    @parse    @permute    @push_back    @r_compile    @r_findall    @r_match    @r_search    @remove    @remove_duplicate    @replace    @scramble    @slice    @sort    @split    @sputter    @string2fun    @string2proc    @strip_path    @stutter    @system    @take    @to_num    @Tracing    @UnTracing   

Most functions acting on tabs operate also on strings.