The kind of an arbitrary Hir
expression.
The empty regular expression, which matches everything, including the
empty string.
A single literal character that matches exactly this character.
A single character class that matches any of the characters in the
class. A class can either consist of Unicode scalar values as
characters, or it can use bytes.
An anchor assertion. An anchor assertion match always has zero length.
A word boundary assertion, which may or may not be Unicode aware. A
word boundary assertion match always has zero length.
A repetition operation applied to a child expression.
A possibly capturing group, which contains a child expression.
A concatenation of expressions. A concatenation always has at least two
child expressions.
A concatenation matches only if each of its child expression matches
one after the other.
An alternation of expressions. An alternation always has at least two
child expressions.
An alternation matches only if at least one of its child expression
matches. If multiple expressions match, then the leftmost is preferred.
Return true if and only if this HIR is the empty regular expression.
Note that this is not defined inductively. That is, it only tests if
this kind is the Empty
variant. To get the inductive definition,
use the is_match_empty
method on Hir
.
Returns true if and only if this kind has any (including possibly
empty) subexpressions.
This method tests for self
and other
values to be equal, and is used by ==
. Read more
This method tests for !=
.
Performs copy-assignment from source
. Read more
Formats the value using the given formatter. Read more
Creates owned data from borrowed data, usually by cloning. Read more
🔬 This is a nightly-only experimental API. (toowned_clone_into
)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static