检查字符类型 - Code Recipes

;\r\nlet symbol_list = \"@#$%^&*\";\r\nlet is_in_list = symbol_list.contains(c2);\r\n//is_in_list is true\r\n\r\nprintln!(\"is_letter is {is_letter}\");\r\nprintln!(\"is_number is {is_number}\");\r\nprintln!(\"is_in_list is {is_in_list}\");"}

;
let symbol_list = "@#$%^&*";
let is_in_list = symbol_list.contains(c2);
//is_in_list is true

println!("is_letter is {is_letter}");
println!("is_number is {is_number}");
println!("is_in_list is {is_in_list}");