Enum regex_syntax::Expr
+
+ [−]
+
+ [src]
+pub enum Expr {
+ Empty,
+ Literal {
+ chars: Vec<char>,
+ casei: bool,
+ },
+ AnyChar,
+ AnyCharNoNL,
+ Class(CharClass),
+ StartLine,
+ EndLine,
+ StartText,
+ EndText,
+ WordBoundary,
+ NotWordBoundary,
+ Group {
+ e: Box<Expr>,
+ i: Option<usize>,
+ name: Option<String>,
+ },
+ Repeat {
+ e: Box<Expr>,
+ r: Repeater,
+ greedy: bool,
+ },
+ Concat(Vec<Expr>),
+ Alternate(Vec<Expr>),
+}A regular expression abstract syntax tree.
+ +An Expr represents the abstract syntax of a regular expression.
Variants
+Empty | An empty regex (which never matches any text). + | ||||||
Literal | A sequence of one or more literal characters to be matched. +Fields+ +
| ||||||
AnyChar | Match any character, excluding new line. + | ||||||
AnyCharNoNL | Match any character. + | ||||||
Class | A character class. + | ||||||
StartLine | Match the start of a line or beginning of input. + | ||||||
EndLine | Match the end of a line or end of input. + | ||||||
StartText | Match the beginning of input. + | ||||||
EndText | Match the end of input. + | ||||||
WordBoundary | Match a word boundary (word character on one side and a non-word +character on the other). + | ||||||
NotWordBoundary | Match a position that is not a word boundary (word or non-word +characters on both sides). + | ||||||
Group | A group, possibly non-capturing. +Fields+ +
| ||||||
Repeat | A repeat operator ( Fields+ +
| ||||||
Concat | A concatenation of expressions. Must be matched one after the other. + +N.B. A concat expression can only appear at the top-level or +immediately inside a group expression. + | ||||||
Alternate | An alternation of expressions. Only one must match. + +N.B. An alternate expression can only appear at the top-level or +immediately inside a group expression. + |
Methods
impl Expr
Trait Implementations
impl Display for Expr
This implementation of Display will write a regular expression from the
+syntax tree. It does not write the original string parsed.