30 Regular expressions library [re]

30.2 Definitions [re.def]

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The following definitions shall apply to this Clause:

30.2.1[defns.regex.collating.element]
collating element

a sequence of one or more characters within the current locale that collate as if they were a single character.

30.2.2[defns.regex.finite.state.machine]
finite state machine

an unspecified data structure that is used to represent a regular expression, and which permits efficient matches against the regular expression to be obtained.

30.2.3[defns.regex.format.specifier]
format specifier

a sequence of one or more characters that is to be replaced with some part of a regular expression match.

30.2.4[defns.regex.matched]
matched

a sequence of zero or more characters is matched by a regular expression when the characters in the sequence correspond to a sequence of characters defined by the pattern.

30.2.5[defns.regex.primary.equivalence.class]
primary equivalence class

a set of one or more characters which share the same primary sort key: that is the sort key weighting that depends only upon character shape, and not accents, case, or locale specific tailorings.

30.2.6[defns.regex.regular.expression]
regular expression

a pattern that selects specific strings from a set of character strings.

30.2.7[defns.regex.subexpression]
sub-expression

a subset of a regular expression that has been marked by parenthesis.