Grep 正则表达式无法与 Windows 上的 Cygwin 一起使用
I'm trying to find all non ascii chars in a file using grep:
grep '[^\x00-\x7F]' myfile
I think this should work but it returns each row in the file.
Any ideas?
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grep无法识别\x语法。打印
（
'H'是字符 0x48。）您的
grep匹配所有行，因为每行都包含\、以外的字符x、0、7、F以及0范围内的任何内容 ..\。请注意，这并非特定于 Cygwin。
GNU grep（Cygwin 拥有的）有一个实验性的
-P选项，告诉它使用类似 Perl 的正则表达式；使用该选项，它确实可以识别\x语法。grepdoesn't recognize the\xsyntax.prints
(
'H'is character 0x48.)Your
grepis matching all lines because each line contains a character other than\,x,0,7,F, and anything in the range0..\.Note that this is not specific to Cygwin.
GNU grep (which is what Cygwin has) has an experimental
-Poption that tells it to use Perl-like regular expressions; with that option, it does recognize the\xsyntax.发现perl可以工作：
perl -n -e 'print if /[^\x00-\x7F]/' file
Found that perl works:
perl -n -e 'print if /[^\x00-\x7F]/' file
Grep 可能会将多字节（即非 ASCII）字符解释为几个单字节（ASCII）字符。 （这样，这个可爱的
∩字符 [U+2229] 将显示为"[U+0022] 后跟一个）[U +0029]。）您需要弄清楚文件的编码并使用了解 Unicode 的更复杂的系统。Grep may be interpreting multibyte (i.e., non-ASCII) characters as several single-byte (ASCII) characters. (This way, this lovely
∩character [U+2229] would show up as"[U+0022] followed by a)[U+0029].) You'll need to figure out the file's encoding and use a more-sphisticated system that knows Unicode.