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I would like to see regex mapped in url so I have the option to send a regex to someone in this website. It doesn't have to be server side URL mapping. Just push the regex to location hash and let JavaScript parse it back.

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You can use permalinks (press the button), which is the preferred way of sharing expressions. Otherwise the following works too: http://www.regex101.com/?regex=...&options=...&text=...&sub=....

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