[yitianxue awk] regular matching

Regular matching uses // Package inside , Represents a regular expression . When using , Use it directly awk Command can .

Single character matching .

OK, let's start ^, End of line $

alternative 、 Non alternative [] [^]

 

Logic or |

 

 

Zero or more *、 Zero or once ?、 One or more +

 

Packet matching  （）