In all the examples that follow, the portions of text matched by patterns are represented with underlines. Remember that the entire target string is said to match even if just a portion of it matches the regular expression. The underline marks are to help demonstrate exactly what part of the target they match.
It's important to read through the following sections; however, don't worry if the information doesn't immediately make sense; it will shortly. The application of these metacharacters will be demonstrated in a bit.
A Simple Metacharacter
The first of the metacharacters is the dot (.). Inside a regular expression, the dot matches any single character except a newline character. For example, in the pattern /p.t/, the . ...