Repeating and Grouping Characters Patterns

Repeating patterns of characters

With this information, we can match most strings of a known length, but most of the time, we don’t know how many characters to match inside a pattern. Regular expressions can take care of this, too. We can modify a pattern with a suffix character. When we think of a regular expression as a product, a repeating sequence is like raising to a power. This follows the pattern of: a*a*a*a == a**4.