Struct regex_syntax::hir::Repetition
source · pub struct Repetition {
pub kind: RepetitionKind,
pub greedy: bool,
pub hir: Box<Hir>,
}
Expand description
The high-level intermediate representation of a repetition operator.
A repetition operator permits the repetition of an arbitrary sub-expression.
Fields§
§kind: RepetitionKind
The kind of this repetition operator.
greedy: bool
Whether this repetition operator is greedy or not. A greedy operator will match as much as it can. A non-greedy operator will match as little as it can.
Typically, operators are greedy by default and are only non-greedy when
a ?
suffix is used, e.g., (expr)*
is greedy while (expr)*?
is
not. However, this can be inverted via the U
“ungreedy” flag.
hir: Box<Hir>
The expression being repeated.
Implementations§
source§impl Repetition
impl Repetition
sourcepub fn is_match_empty(&self) -> bool
pub fn is_match_empty(&self) -> bool
Returns true if and only if this repetition operator makes it possible to match the empty string.
Note that this is not defined inductively. For example, while a*
will report true
, ()+
will not, even though ()
matches the empty
string and one or more occurrences of something that matches the empty
string will always match the empty string. In order to get the
inductive definition, see the corresponding method on
Hir
.
Trait Implementations§
source§impl Clone for Repetition
impl Clone for Repetition
source§fn clone(&self) -> Repetition
fn clone(&self) -> Repetition
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for Repetition
impl Debug for Repetition
source§impl PartialEq<Repetition> for Repetition
impl PartialEq<Repetition> for Repetition
source§fn eq(&self, other: &Repetition) -> bool
fn eq(&self, other: &Repetition) -> bool
self
and other
values to be equal, and is used
by ==
.