Week 5: Regular expressions

• Turning strings into structured things
• Running example: DNA and amino acid motifs
• DNA and amino encoding
• Translating DNA to amino acids
• Translating DNA to amino acids
• Motifs
• Finding motifs by hand
• Regular expressions: a better way
• Characters and character classes
• Matching practice
• The re module
• re.findall practice
• Special characters, escape characters, and raw strings
• Escaping practice
• Choice a/k/a parallel composition; groups
• Choice practice
• Repetition
• US phone numbers
• Unbounded repetition
• Using re.search, re.match, and re.fullmatch
• Practice with Match objects
• ISO 8601 dates
• Substitutions and backreference
• A word of caution