Showing content from https://timsong-cpp.github.io/cppwp/n4659/re.req below:
31 Regular expressions library [re]
Expression Return type Assertion/note pre-/post-condition X::char_type charT The character container type used in the implementation of class template basic_regex. X::string_type basic_string<charT> X::locale_type A copy constructible type A type that represents the locale used by the traits class. X::char_class_type A bitmask type. A bitmask type representing a particular character classification. X::length(p) size_t Yields the smallest i such that p[i] == 0. Complexity is linear in i . v.translate(c) X::char_type Returns a character such that for any character d that is to be considered equivalent to c then v.translate(c) == v.translate(d). v.translate_nocase(c) X::char_type For all characters C that are to be considered equivalent to c when comparisons are to be performed without regard to case, then v.translate_nocase(c) == v.translate_nocase(C). v.transform(F1, F2) X::string_type Returns a sort key for the character sequence designated by the iterator range [F1, F2) such that if the character sequence [G1, G2) sorts before the character sequence [H1, H2) then v.transform(G1, G2) < v.transform(H1, H2). v.transform_primary(F1, F2) X::string_type Returns a sort key for the character sequence designated by the iterator range [F1, F2) such that if the character sequence [G1, G2) sorts before the character sequence [H1, H2) when character case is not considered then v.transform_primary(G1, G2) < v.transform_primary(H1, H2). v.lookup_collatename(F1, F2) X::string_type Returns a sequence of characters that represents the collating element consisting of the character sequence designated by the iterator range [F1, F2). Returns an empty string if the character sequence is not a valid collating element. v.lookup_classname(F1, F2, b) X::char_class_type Converts the character sequence designated by the iterator range [F1, F2) into a value of a bitmask type that can subsequently be passed to isctype. Values returned from lookup_classname can be bitwise or'ed together; the resulting value represents membership in either of the corresponding character classes. If b is true, the returned bitmask is suitable for matching characters without regard to their case. Returns 0 if the character sequence is not the name of a character class recognized by X. The value returned shall be independent of the case of the characters in the sequence. v.isctype(c, cl) bool Returns true if character c is a member of one of the character classes designated by cl, false otherwise. v.value(c, I) int Returns the value represented by the digit c in base I if the character c is a valid digit in base I; otherwise returns -1. [ Note: The value of I will only be 8, 10, or 16. — end note ] u.imbue(loc) X::locale_type Imbues u with the locale loc and returns the previous locale used by u if any. v.getloc() X::locale_type Returns the current locale used by v, if any.
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