RegEx is the tool to use when one needs to get the quick and dirty in a hurry. Even the most basic of expressions can come in handy a lot.

RegEx is supported by a miriad of tools and programs such as grep, egrap, sed, the many flavors of awk, etc.

Represents any single character in a single position. However, dot loses all its power Inside a character class. There the dot is just a mere mortal dot.