20.22 Debian自带的grep不支持-P
http://scz.617.cn/unix/201109081021.txt
Q:
在Debian上执行"grep --help"可以看到:
-P, --perl-regexp PATTERN is a Perl regular expression
但实际测试表明Debian自带的grep不支持-P:
$ echo 'foobar_infix_bar' | grep -P '(?<!foo)bar' grep: Support for the -P option is not compiled into this --disable-perl-regexp binary
A: scz@nsfocus 2011-09-08 10:21
Debian有变通解决方案，用pcregrep即可。
aptitude install pcregrep
据说aptitude比apt-get更好。
$ echo 'foobar_infix_bar' | pcregrep '(?<!foo)bar' foobar_infix_bar $ echo 'prefix_foobar_suffix' | pcregrep '(?<!foo)bar' $ echo 'foobar' | pcregrep 'foo(?!bar)' $ echo 'foo_bar' | pcregrep 'foo(?!bar)' foo_bar