Struct regex_syntax::hir::Repetition

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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

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The kind of this repetition operator.

greedy: bool

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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>

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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.

fn clone_from(&mut self, source: &Self)

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Performs copy-assignment from source.

impl Debug for Repetition

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fn fmt(&self, f: &mut Formatter) -> Result

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Formats the value using the given formatter.

impl Eq for Repetition

impl PartialEq for Repetition

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fn eq(&self, other: &Repetition) -> bool

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This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Repetition) -> bool

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This method tests for !=.