Developer Cheat Sheets

A quick reference for regular expression syntax: anchors, character classes, quantifiers, groups, lookarounds and common patterns.

A quick reference for cron expression syntax: the five fields, special characters, and common schedules.

A quick reference for the most-used Git commands: staging, committing, branching, remotes, and undoing changes.

A compact reference of HTTP status codes grouped by class (1xx–5xx), with a one-line meaning for each.