Web Reference: class Regexp A regular expression (also called a regexp) is a match pattern (also simply called a pattern). A common notation for a regexp uses enclosing slash characters: A character class lets you define a range or a list of characters to match. For example, [aeiou]matches any vowel. Example: Does the string containa vowel? This will not take into account the amountof characters, we will see how to do that soon. Rubular is a Ruby-based regular expression editor. It's a handy way to test regular expressions as you write them. To start, enter a regular expression and a test string. Or you can try an example.
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