We saw how to match any character using the dot character. What if you want to match a specific set of characters only?
You can pass the characters you want to match between square brackets [] to match them, and this is the character class.
Let's take the following file as an example:
I love bash scripting.I hope it works without a crash.Or I'll smash it.
Let's see how the character class works:
$ awk '/[mbr]ash/{print $0}' myfile$ sed -n '/[mbr]ash/p' myfile
The character class [mbr] matches any of the included characters followed by ash, so this matches the three lines.
You can employ it in something useful, such as matching ...
