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peggrammar <- rule+ EOF;
rule <- rule_name LEFT_ARROW ordered_choice ';';
ordered_choice <- sequence (SLASH sequence)*;
sequence <- prefix+;
prefix <- (AND/NOT)? sufix;
sufix <- expression (QUESTION/STAR/PLUS)?;
expression <- regex / rule_crossref
/ (OPEN ordered_choice CLOSE) / str_match;
rule_name <- r'[a-zA-Z_]([a-zA-Z_]|[0-9])*';
rule_crossref <- rule_name;
regex <- 'r\'' r'(\\\'|[^\'])*' '\'';
str_match <- r'\'(\\\'|[^\'])*\'|"[^"]*"';
LEFT_ARROW <- '<-';
SLASH <- '/';
AND <- '&';
NOT <- '!';
QUESTION <- '?';
STAR <- '*';
PLUS <- '+';
OPEN <- '(';
CLOSE <- ')';
DOT <- '.';
comment <- '//' r'.*\n';
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