Syntax

  single-byte-utf8-char

You can use single-byte-utf8-char as a pattern to match only ASCII UTF-8 encoded characters (those with numeric values 0 to 127) in your input data.

In most cases, you may be able to use just the companion to this syntax item, multi-byte-utf8-char to process multi-byte utf8 characters separately. However, there may be cases where you want to use single-byte-utf8-char+ to match single-byte UTF-8 characters and throw them away, for example.

Example:

  include "utf8pat.xin"
    process
    repeat scan "flamb%195#%169#"
         match single-byte-utf8-char+ => c
              output c
         match multi-byte-utf8-char => c
              local integer n initial {utf8-char-number c}
              do when n > 255
                   output "&#x" || "16rud" % n || ";"
              else
                   output "b" % n
              done
      again

For other related constants and keywords, see the UTF-8 text processing legacy library.

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