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\c
Combined from primary sources listed below.

In Regexes§

See primary documentation in context for \c and \C.

\c takes a parameter delimited by square-brackets which is the name of a Unicode character as it appears in the Unicode Character Database (UCD) and matches that specific character. For example:

'a.b' ~~ /\c[FULL STOP]/ and say ~$/;    # OUTPUT: «.␤»

\C matches a single character that is not the named Unicode character.

Note that the word "character" is used, here, in the sense that the UCD does, but because Raku uses NFG, combining code points and the base characters to which they are attached, will generally not match individually. For example if you compose "ü" as "u\x[0308]", that works just fine, but matching may surprise you:

say "u\x[0308]" ~~ /\c[LATIN SMALL LETTER U]/;    # OUTPUT: «Nil␤»

To match the unmodified character, you can use the :ignoremark adverb.