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Mar 23 at 9:58 comment added David Friant Hi! Thanks for your answer. I am tempted to change the accepted answer to this one as it does provide a far more robust regex experience. However, the expl3 syntax may as well have been ancient Sumerian for as well as I could understand it before finding some introduction and full reference for it. I would suggest adding some links to the relevant docs as the expl3 layer is (at first) esoteric, even by TeX standards.
Mar 22 at 20:55 history answered egreg CC BY-SA 4.0