Using POSIX extended regular expressions

POSIX extended regular expressions (PERE) is a way to describe string using wildcards and pattern. The following description doesn't provide a full description of PERE but just intend to help you at the beginning.

the following rules are available:

a|b search for a or b
ab search for the symbol a followed by symbol b
. this symbol match any other.
a* symbol a from 0 upto unlimited times.
[abc] search for a or b or c
[a-z] search for symbol between a (included) and z (included).
[^a-z] search for symbol not between a (included) and z (included).
word abc
^abc search for line beginning by the word abc.
abc$ search for line ending by the word abc.

You can mix these rules as you need.

Here is some samples:

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