Enum regex_automata::dfa::StartKind

pub enum StartKind {
    Both,
    Unanchored,
    Anchored,
}

Available on crate feature dfa-search and (crate features dfa-search or dfa-onepass) only.

The kind of anchored starting configurations to support in a DFA.

Fully compiled DFAs need to be explicitly configured as to which anchored starting configurations to support. The reason for not just supporting everything unconditionally is that it can use more resources (such as memory and build time). The downside of this is that if you try to execute a search using an Anchored mode that is not supported by the DFA, then the search will return an error.

Variants

Both

Support both anchored and unanchored searches.

Unanchored

Support only unanchored searches. Requesting an anchored search will panic.

Note that even if an unanchored search is requested, the pattern itself may still be anchored. For example, ^abc will only match abc at the start of a haystack. This will remain true, even if the regex engine only supported unanchored searches.

Anchored

Support only anchored searches. Requesting an unanchored search will panic.

Trait Implementations

impl Clone for StartKind

fn clone(&self) -> StartKind

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for StartKind

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

Formats the value using the given formatter.

impl PartialEq for StartKind

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

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

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for StartKind

impl Eq for StartKind

impl StructuralPartialEq for StartKind