1. Class 4
Regular Expressions & Enumerables

2. Regular Expressions
/regex will find me/
3. What are Regular Expressions
Regular expressions allow matching and manipulation of textual data.
Abbreviated as regex or regexp, or alternatively, just patterns
4. What are Regular Expressions For?
Scan a string for multiple occurrences of a pattern.
Replace part of a string with another string.
Split a string based on a matching separator.
5. Regular Expressions in Ruby

Regular expressions are put between two forward slashes (/match_me/)

6. They are escaped with a backward slash ().