Struct regex_syntax::ExprBuilder

pub struct ExprBuilder { /* fields omitted */ }

A builder for configuring regular expression parsing.

This allows setting the default values of flags and other options, such as the maximum nesting depth.

Implementations

impl ExprBuilder

pub fn new() -> ExprBuilder

Create a new builder for configuring expression parsing.

Note that all flags are disabled by default.

pub fn case_insensitive(self, yes: bool) -> ExprBuilder

Set the default value for the case insensitive (i) flag.

pub fn multi_line(self, yes: bool) -> ExprBuilder

Set the default value for the multi-line matching (m) flag.

pub fn dot_matches_new_line(self, yes: bool) -> ExprBuilder

Set the default value for the any character (s) flag.

pub fn swap_greed(self, yes: bool) -> ExprBuilder

Set the default value for the greedy swap (U) flag.

pub fn ignore_whitespace(self, yes: bool) -> ExprBuilder

Set the default value for the ignore whitespace (x) flag.

pub fn unicode(self, yes: bool) -> ExprBuilder

Set the default value for the Unicode (u) flag.

If yes is false, then allow_bytes is set to true.

pub fn allow_bytes(self, yes: bool) -> ExprBuilder

Whether the parser allows matching arbitrary bytes or not.

When the u flag is disabled (either with this builder or in the expression itself), the parser switches to interpreting the expression as matching arbitrary bytes instead of Unicode codepoints. For example, the expression (?u:\xFF) matches the codepoint \xFF, which corresponds to the UTF-8 byte sequence \xCE\xBF. Conversely, (?-u:\xFF) matches the byte \xFF, which is not valid UTF-8.

When allow_bytes is disabled (the default), an expression like (?-u:\xFF) will cause the parser to return an error, since it would otherwise match invalid UTF-8. When enabled, it will be allowed.

pub fn nest_limit(self, limit: usize) -> ExprBuilder

Set the nesting limit for regular expression parsing.

Regular expressions that nest more than this limit will result in a StackExhausted error.

pub fn parse(self, s: &str) -> Result<Expr>

Parse a string as a regular expression using the current configuraiton.

Trait Implementations

impl Clone for ExprBuilder

fn clone(&self) -> ExprBuilder

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ExprBuilder

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

Formats the value using the given formatter.