Grep:排在第一位的是第一个字？结束？

这应该就是这样做的:

$ grep '^as\w*ng\b' file

Regexplanation:

^    # Matches start of the line
as   # Matches literal string as
\w   # Matches characters in word class
*    # Quantifies \w to match either zero or more
ng   # Matches literal string ng
\b   # Matches word boundary

可能已经错过了奇怪的角落案例.

如果您只想打印匹配的单词而不是整行,请使用以下-o选项:

$ grep -o '^as\w*ng\b' file

阅读man grep有关可用选项的所有信息.