pub enum Error {
    Syntax(String),
    CompiledTooBig(usize),
    // some variants omitted
}
Expand description

An error that occurred during parsing or compiling a regular expression.

Variants

Syntax(String)

A syntax error.

CompiledTooBig(usize)

The compiled program exceeded the set size limit. The argument is the size limit imposed by RegexBuilder::size_limit. Even when not configured explicitly, it defaults to a reasonable limit.

If you’re getting this error, it occurred because your regex has been compiled to an intermediate state that is too big. It is important to note that exceeding this limit does not mean the regex is too big to work, but rather, the regex is big enough that it may wind up being surprisingly slow when used in a search. In other words, this error is meant to be a practical heuristic for avoiding a performance footgun, and especially so for the case where the regex pattern is coming from an untrusted source.

There are generally two ways to move forward if you hit this error. The first is to find some way to use a smaller regex. The second is to increase the size limit via RegexBuilder::size_limit. However, if your regex pattern is not from a trusted source, then neither of these approaches may be appropriate. Instead, you’ll have to determine just how big of a regex you want to allow.

Trait Implementations

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Formats the value using the given formatter. Read more
👎Deprecated since 1.42.0: use the Display impl or to_string()
The lower-level source of this error, if any. Read more
👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
🔬This is a nightly-only experimental API. (error_generic_member_access)
Provides type based access to context intended for error reports. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of [From]<T> for U chooses to do.

🔬This is a nightly-only experimental API. (provide_any)
Data providers should implement this method to provide all values they are able to provide by using demand. Read more
The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
Converts the given value to a String. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.