Struct RegEx 

pub struct RegEx { /* private fields */ }

RegEx provides methods to construct a regular expression from a pattern string and perform common operations such as matching and searching within input text.

Internally, it compiles the pattern into an NFA.

Implementations

impl RegEx

pub fn from_pattern(regex: &str) -> Result<Self, Error>

Parses the given pattern and returns a compiled RegEx.

Errors

Returns an error if the pattern contains invalid syntax.

Supported Syntax

• . matches any single character
• | for alternate: a|b matches a or b
• [] for character classes: [abc] matches any character in the set
• Use ^ at the beginning to negate: [^abc] matches any character except a, b, or c

Predefined character classes:

• \d, \D for digits
• \l, \L for lowercase letters
• \u, \U for uppercase letters
• \s, \S for whitespace

pub fn recognise(&self, string: &str) -> bool

Returns whether the given string has a match for the regular expression

pub fn search(&self, haystack: &str) -> Option<usize>

Returns the index of the first match with the regular expression within the given string, or None if there aren’t any.

Trait Implementations

impl Debug for RegEx

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

Formats the value using the given formatter.