Support common character sets \w, \d, \s #15
Description
They should match the same sets of characters as in JavaScript: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#character-classes
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They should match the same sets of characters as in JavaScript: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#character-classes