Given the sample input/output you posted all you need is: $ grep '^/[^?]*_' file /abc_bcd/def/ /foo_bar_foo /image_bar?s=color /foo_bar ... ... <看更多>

GNU grep understands these with -P , but if you want portability, POSIX basic and extended regular expressions are more often used with Unix command line tools. ... <看更多>

searching with regular expressions, grep, find. previous & next. on the software carpentry do the “finding things” section, except for “tracking a species” ( ... ... <看更多>