Explore Capsules

Regular expressions are powerful tools for matching and validating text, but they require careful construction to avoid errors and performance issues. This collection presents practical patterns for common tasks like email and IP address validation, explains how to use anchors and assertions to control matches, and highlights strategies to prevent security risks such as catastrophic backtracking. It also covers Unicode-aware techniques and testing methods to ensure reliable and efficient regex usage.

Your resume has to survive parsing software before a recruiter ever sees your name. These tactics split on how far to bend to the machine: strict formatting rules to avoid parsing errors, running your file through the same software recruiters use, or writing for the human reader first and trusting clean structure to pass. The balance you strike decides whether you get filtered out or called back.

Software design patterns provide proven solutions to common programming challenges by defining reusable templates for object creation, behavior, and structure. This collection covers fundamental patterns such as those that manage object creation, enable flexible behavior changes, and facilitate communication between components, helping developers build maintainable and scalable software systems.