判断字符串是否包含正则表达式默认的特殊字符
业务描述:
上层配置的字符列表中,既有准确的字符串,又有可以进行正则匹配的字符串,这时候需要区分出来那些是正则匹配的字符串。
思路:
判断字符串中,是否存在正则表达式默认的特殊字符,如*^${}等。
代码:
#include <iostream>
#include <regex>using namespace std;// check if code contains regex special chars:*$^+?\{}|
static const string regexLimit = {".*[*$^+?\\\\{}|]+.*"};
static const std::regex pattern(regexLimit);
bool isRegex(const std::string& str) {try {return std::regex_match(str, pattern);}catch(const std::exception& e) {std::cout << "regex error:" << e.what() << endl;return false;}
}int main(int argc, char const *argv[])
{std::cout<< "hello world!" << std::endl;string temp1 = "*demo.*";string temp2 = "^com.*.demo.*";string temp3 = "car$";string temp4 = "com.d+dmode";string temp5 = "com.d?dmode";string temp6 = "com.d\\dmode";string temp7 = "com.d{dmode";string temp8 = "com.d}dmode";string temp9 = "com.d|dmode";string temp41 = "com.demo.test";vector<std::string> list;list.push_back(temp1);list.push_back(temp2);list.push_back(temp3);list.push_back(temp4);list.push_back(temp5);list.push_back(temp6);list.push_back(temp7);list.push_back(temp8);list.push_back(temp9);list.push_back(temp41);for (size_t i = 0; i < list.size(); i++){bool result = isRegex(list[i]);printf("i:%ld isRegex?:%d\n", i, result);}printf("hello world end.");return 0;
}
输出:
hello world!
i:0 isRegex?:1
i:1 isRegex?:1
i:2 isRegex?:1
i:3 isRegex?:1
i:4 isRegex?:1
i:5 isRegex?:1
i:6 isRegex?:1
i:7 isRegex?:1
i:8 isRegex?:1
i:9 isRegex?:0
hello world end.