[Israel.pm] 8-bit characters recognition

Omer Zak omerz at actcom.co.il
Wed May 19 05:23:53 PDT 2004


On Wed, 19 May 2004, Roman M. Parparov wrote:

> What would be a simple way to recognize if an 8-bit (ord($c) > 0x7f)
> character is present in a string?

1. Don't use pattern matching.
2. If speed is your utmost considration, write a C function to do the job
   and invoke it from your Perl script.
   IIRC, 80x86 machine language supports this kind of operation by
   prefixing an instruction with the rep prefix.
3. If speed is not that big concern, implement a loop which scans the
   string character by character, and compare ord(char)&0x80 to zero.

                                             --- Omer
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