Regular Expressions 30-minute introductory tutorial

Point I jump to the original

My supplementary

To remember all its grammar, it is difficult to understand the way it works, remember the basic, and then check the remaining time.

Regular expressions are a standard, including basic regular expressions, extended regular expressions.

The characters in a regular expression include metacharacters, ordinary characters . Learning regular expressions is the meaning and usage of the meta-characters in the learning.

Meta-characters in basic regular expressions

Extending meta-characters in regular expressions

(Linux tools such as Awk and Perl also support some meta-characters that are extended by regular expressions, Egrep also supports)

Regular Expressions 30-minute introductory tutorial