Topics

• Pattern Matching and Replacement
• Date and Time
• Regular Expressions (regex)
• Implement State Machine Pattern using S4 Class
• Modifying strings by substitution

Examples

• Parsing Lines using State Machine
• Go to the End of the Month
• Go to First Day of the Month
• Move a date a number of months consistently by months
• Eliminate duplicated consecutive elements
• Validate a date in a "YYYYMMDD" format
• Validate US States postal abbreviations
• Validate US phone numbers