Re: Read RegEx from file

Just to touch on one point in your OP:

From the docs for utf8:

"The use utf8 pragma tells the Perl parser to allow UTF-8 in the program text in the current lexical scope (...)
Do not use this pragma for anything else than telling Perl that your script is written in UTF-8."

(Emphasis in original)

The way forward always starts with a minimal test.

Comment on Re: Read RegEx from file

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Re^2: Read RegEx from file by Melly (Chaplain) on Jan 14, 2016 at 16:42 UTC
So I'd only need utf8 if I was specifying my search expressions in utf-8 rather than using the octal notation? (or, for some reason, wanted to use utf in a variable name). Basically, I read your advice as "you can take it out - it's not needed for reading from a utf8 file" - is that right? `map{$a=1-$_/10;map{$d=$a;$e=$b=$_/20-2;map{($d,$e)=(2$d$e+$a,$e2 -$d2+$b);$c=$d2+$e2>4?$d=8:_}1..50;print$c}0..59;print$/}0..20` [download] Tom Melly, pm (at) cursingmaggot (stop) co (stop) uk	[reply] [d/l]
Re^3: Read RegEx from file by 1nickt (Canon) on Jan 14, 2016 at 16:55 UTC
That's right. You only need (and should only use) `use utf8;` if the source code of your script is in UTF-8, e.g. variable names, text within the script file, etc. For reading in a file that is UTF-8, use an IO layer. See binmode, the docs for which say: `To mark FILEHANDLE as UTF-8, use :utf8 or :encoding(UTF-8) . :utf8 jus +t marks the data as UTF-8 without further checking, while :encoding(U +TF-8) checks the data for actually being valid UTF-8. More details ca +n be found in PerlIO::encoding.` [download] The way forward always starts with a minimal test.	[reply] [d/l] [select]