"Regular expressions" are a mathematically defined concept, invented by Stephen Kleene in 1956. In their most minimalistic (and original) version, these expressions define languages using just literal ...

This is how to convert regex (REGular EXpression) to DFA by creating and using syntax tree in Java language. This project is a part of a bigger project we'd done for Compiler Course to create a simple ...

プログラマーなら一度はこう思ったことがあるはず。「え、なんで ^.*?(foo|bar)+$ で文字列を判定できるの？」「なんで1行で1000文字超えるの？」――そう、それが正規表現、通称「Regex」。 文字列マッチングという一見地味な分野で、なぜここまで厨二病的な ...

I was involved in a recent discussion on the "best" way to remove a given parameter from a URL string. The conversation began with using string primitives to split and join the parameter, a method ...