In Perl, a regular expression is often used to match a string containing a dot (.). The dot (.) in a regular expression is a special character that matches any single character except for a newline. If you want to match an actual dot, you need to escape it with a backslash (\). 

Here's the example :

In this example, the regular expression /\./ is used to match a dot in the string. The backslash \ is an escape character, and it tells Perl to treat the dot as a literal character rather than its special meaning of matching any character.

If you want to match a specific pattern that includes a dot, you can adjust the regular expression accordingly. For example, to match a string that starts with "example" followed by a dot and then any characters, you can use:

In this case, ^ represents the start of the string, and the backslash \ is used to escape the dot.

Credit:> Stackoverflow

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