GNU的较少实用程序的手册页有关于搜索的以下内容：
/pattern
Search forward in the file for the N-th line containing the pattern. N
defaults to 1. The pattern is a regular expression,as recognized by the
regular expression library supplied by your system.
我在各种系统上使用的少：我的个人Ubuntu笔记本电脑,我的CentOS云服务器,在Cygwin工作,等等.我不断想做一些像负面的前瞻和其他花哨的东西,但我不知道什么是正则表达式要使用的语法我怎么知道？
它是一个编译时参数. less的./configure脚本知道with-regex = LIB参数.
这是上游软件包的README的引用：
–with-regex=lib
Specifies the regular expression library used by less for pattern
matching. The default is "auto",which means the configure program
finds a regular expression library automatically. Other values are:
posix Use the POSIX-compatible regcomp.
pcre Use the PCRE library.
regcmp Use the regcmp library.
re_comp Use the re_comp library.
regcomp Use the V8-compatible regcomp.
regcomp-local Use Henry Spencer's V8-compatible regcomp
(source is supplied with less).
所以你需要知道’./configured’有多少.我在Debian / Ubuntu上进行了调查.他们使用POSIX正则表达式lib.
我仍然在寻找一种通过脚本动态检测它的方法…
