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Re:Ask HN: What new skills are you learning? by pc86 on Wednesday March 25, 2015 @03:36PM (#9265384)
Not helpful at all for learning, but I've found RegExper[1] is fantastic for visualizing existing expressions, particularly ones you haven't written but need to understand or edit.

[1] http://www.regexper.com/

Re:Ask HN: What new skills are you learning? by tovmeod on Wednesday March 25, 2015 @05:22PM (#9266015)