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[\\d]+and[0-9]+should be just\\d+(well, some may find[0-9]+more readable). I'm not going to edit the question, but you may want to fix this answer.\dwill match anything that's considered a number, even in other numbering systems (Chinese, Arabic, etc.), while[0-9]will just match the standard digits. I did standardize on\\d, though, and factored it into theoptionalDecimalpattern.