Library › Book 12 › Regular Expressions
Regular Expressions
19.1🔒OverviewRegular expressions are a miniature language for describing text patterns. They let you ask questions like "does this string look like an…
19.2🔒Pattern Matching BasicsA regular expression defines a pattern that can match text. All three languages support regex, though the syntax for creating and using…
19.3🔒Capture GroupsCapture groups let you extract specific parts of a match. They are defined with parentheses. Named groups make your code self-documenting…
19.4🔒Common QA PatternsCertain regex patterns come up repeatedly in QA work: validating emails, matching URLs, extracting version numbers, and parsing structured…
19.5🔒Exercises: Chapter 19Easy: Write a function in all three languages that takes a string and returns true if it matches a valid phone number format (e.g., (555)…
19.6🔒Q&AQuiz: Chapter 191. What is the difference between re.match() and re.search() in Python? 2. What does the g flag do in a JavaScript regular expression? 3…
19.7🔒Career Translation- Built regex-based log parsers that extracted timestamps, error levels, and structured data from production logs, enabling automated…
19.8🔒Q&AInterview Depth CheckPrompt: You have a log file with lines like 2024-03-15T14:23:01 ERROR [PaymentService] Transaction failed for user_id=4821. How would you…