[英]Remove leading zeros from multiple numbers in string? [C++]
Let's say I have a string that contains "00001234 00002345", but I want to output it at "1234 2345". 假设我有一个包含“ 00001234 00002345”的字符串,但我想将其输出为“ 1234 2345”。 How would I go about that?
我将如何处理?
str.erase(0, str.find_first_not_of('0'));
This removes the 0's from the first number, but not any preceding number. 这将从第一个数字中删除0,但不会删除任何先前的数字。
You can use a \\b0+
regex (it matches 0
symbols after a non-word character, ie [a-zA-Z0-9_]
) if you are interested in a regex solution: 如果您对正则表达式解决方案感兴趣,则可以使用
\\b0+
正则表达式(它在非单词字符后匹配0
符号,即[a-zA-Z0-9_]
):
std::string input("00001234 00002345");
std::regex rgx(R"(\b0+)");
std::cout << std::regex_replace(input, rgx, "");
// => 1234 2345
See IDEONE demo 见IDEONE演示
Note that raw string literals allow us to use single backslashes to escape regex metacharacters. 请注意,原始字符串文字允许我们使用单个反斜杠来转义正则表达式元字符。
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