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Struct `std.regex.Captures`

Captures object contains submatches captured during a call to match or iteration over RegexMatch range.


						
				struct Captures(R)
				

				  
				

				if (isSomeString!R);

First element of range is the whole match.

Properties

Name	Type	Description
`back`[get]	`R`	Range interface.
`captures`[get]	`auto`	A hook for compatibility with original std.regex.
`empty`[get]	`bool`	Range interface.
`front`[get]	`R`	Range interface.
`hit`[get]	`R`	Slice of matched portion of input.
`length`[get]	`size_t`	Number of matches in this object.
`post`[get]	`R`	Slice of input immediately after the match.
`pre`[get]	`R`	Slice of input prior to the match.
`whichPattern`[get]	`int`	Number of pattern matched counting, where 1 - the first pattern. Returns 0 on no match.

Methods

Name	Description
`opCast` ()	Explicit cast to bool. Useful as a shorthand for !(x.empty) in if and assert statements.
`opIndex` (i)	Range interface.
`opIndex` (i)	Lookup named submatch.
`popBack` ()	Range interface.
`popFront` ()	Range interface.

Example

import std.range.primitives : popFrontN;

auto c = matchFirst("@abc#", regex(`(\w)(\w)(\w)`));
assert(c.pre == "@"); // Part of input preceding match
assert(c.post == "#"); // Immediately after match
assert(c.hit == c[0] && c.hit == "abc"); // The whole match
writeln(c[2]); // "b"
writeln(c.front); // "abc"
c.popFront();
writeln(c.front); // "a"
writeln(c.back); // "c"
c.popBack();
writeln(c.back); // "b"
popFrontN(c, 2);
assert(c.empty);

assert(!matchFirst("nothing", "something"));

// Captures that are not matched will be null.
c = matchFirst("ac", regex(`a(b)?c`));
assert(c);
assert(!c[1]);

Authors

Dmitry Olshansky,

API and utility constructs are modeled after the original std.regex by Walter Bright and Andrei Alexandrescu.

License

Boost License 1.0.