Struct regex_syntax::hir::Repetition
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pub struct Repetition { pub kind: RepetitionKind, pub greedy: bool, pub hir: Box<Hir>, }
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.
Methods
impl Repetition
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pub fn is_match_empty(&self) -> bool
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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
impl Clone for Repetition
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fn clone(&self) -> Repetition
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl Debug for Repetition
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fn fmt(&self, __arg_0: &mut Formatter) -> Result
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Formats the value using the given formatter. Read more
impl Eq for Repetition
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impl PartialEq for Repetition
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fn eq(&self, __arg_0: &Repetition) -> bool
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This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &Repetition) -> bool
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This method tests for !=
.