- make patterns synonym of design-patterns
because most of the questions in "patterns" tag currently fit
- spin-off "pattern" questions that don't fall under "design patterns" into
a dedicated tag similar to Stack Overflow 'pattern-matching':
Testing whether a data structure has a particular shape or contains particular values in certain locations. Many functional languages provide pattern matching constructs. Most questions in this tag should also have the tag for the language you are programming in. Do not use this tag for regular expression questions, use regex instead...