Character Description Example . Matches any single character. a.c matches aac, abc, azc, a2c, a$c e... \d Matches a decimal digit character (i.e. 0‑9). a\d matches a1, a2, a3 etc. but not aa... \D Matches a non‑digit character. a\D matches ab but not a1, a2, a3 etc.
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