Regular expressions have been part of the programmer’s toolkit for a long time, with their creation by Stephen Cole King in 1951. Their ability to match word patterns make them a powerful tool for ...

「この文章には半角ハテナが含まれているか？」をmatchで調べようとしたらUncaught SyntaxError: Invalid regular expressionで落ちた話。 matchの引数として渡す比較用文字列を、正規表現であることを明記した上でエスケープしておく。ただクオーテーションで囲んで ...

ECMAScript RegExp match array offsets provide additional information about the position of a captured substring relative to the index of the match. An example implementation can be found in ...

New features in ECMAScript 2022 include top-level await, RegExp match indices, new public and private class fields, and more. Let's get started! ECMAScript 2022 (ES13) dropped on June 22, codifying ...

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