Not elegant, but fits the spec:

/0.1|1.2|2.3|3.4|4.5|5.6|6.7|7.8|8.9|9.0/

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Optimising for fewest key strokes only makes sense transmitting to Pluto or beyond

In reply to Re^3: arithmetic in a regex ? by GrandFather
in thread arithmetic in a regex ? by Anonymous Monk

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