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This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including uxregexp. Try it out:
var UXRegExp = require("uxregexp")
var uxre = new UXRegExp(' \n\
(?<year> [0-9]{4} ) -? # year \n\
(?<month> [0-9]{2} ) -? # month \n\
(?<day> [0-9]{2} ) # day \n\
| \n\
(?<month> [0-9]{2} ) / # month \n\
(?<day> [0-9]{2} ) / # day \n\
(?<year> [0-9]{4} ) # year \n\
',
'xg'
);
var match = uxre.exec("2020-12-31");
return match;
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