Question

我想检查它是否符合以下格式：

（整数，整数），包括括号和逗号。例如：for（3,4）将返回true，而（6.4将返回false 我试过

string input;
regex check("(\\-|+)?[[:d:]]+,?(\\-|+)?[[:d:]]+");
cin >> input;
if (regex_match(input, check)) cout << "okay" << endl;
else cout << "error";

但是我遇到了运行时错误

Answer 1

看来你正在寻找

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当与regex check(R"($[-+]?\d+,[-+]?\d+$)")一起使用时，它会定义类似^$[-+]?\d+,[-+]?\d+$$的模式，需要完整的字符串匹配。

详细说明：

std::regex_match - 字符串的开头（隐含在^）
regex_match - \(
( - 1或0 [-+]?或+字符
- - 一位或多位
\d+ - 逗号
, - 1或0 [-+]?或+字符
- - 一位或多位
\d+ - \)
) - 字符串结尾（隐含在$）

C++ demo：

regex_match

输出：

regex check(R"(\([-+]?\d+,[-+]?\d+\))");
string s1("(44,45)");
string s2("(44,45");
smatch match;
if (regex_match(s1, match, check)) {
        cout << s1 << ": Matched!" << endl; 
} else {
    cout << s1 << ": Not matched!" << endl; 
}
if (regex_match(s2, match, check)) {
        cout << s2 << ": Matched!" << endl;     
} else {
    cout << s2 << ": Not matched!" << endl; 
}

Answer 2

尝试输入此正则表达式$\d{1,},\d{1,}$

也许它可能有用

如何在C ++上使用正则表达式匹配以下坐标模式？

2 个答案: