它应符合以下标准(条件部分在方括号中：
%[some numbers][.some numbers]d|f|s
符号d | f | s表示其中一个必须在那里.
谢谢& BR -Matti
解决方法
这应该这样做：
string input = "Bloke %s drank %5.2f litres of water and ate %d bananas";
string pattern = @"%(\d+(\.\d+)?)?(d|f|s)";
foreach (Match m in Regex.Matches(input,pattern))
{
Console.WriteLine(m.Value);
}
我没有在我的模式中使用[dfs],因为我计划更新它以使用命名组.这是基于your earlier question关于确定C风格格式字符串的替换策略.
这是一个想法：
string input = "Bloke %s drank %5.2f litres of water and ate %d bananas";
string pattern = @"%(?<Number>\d+(\.\d+)?)?(?<Type>d|f|s)";
int count = 0;
string result = Regex.Replace(input,pattern,m =>
{
var number = m.Groups["Number"].Value;
var type = m.Groups["Type"].Value;
// now you can have custom logic to check the type appropriately
// check the types,format with the count for the current parameter
return String.Concat("{",count++,"}");
});
C#/.NET 2.0方法：
private int formatCount { get; set; }
void Main()
{
string input = "Bloke %s drank %5.2f litres of water and ate %d bananas";
Console.WriteLine(FormatCStyleStrings(input));
}
private string FormatCStyleStrings(string input)
{
formatCount = 0; // reset count
string pattern = @"%(?<Number>\d+(\.\d+)?)?(?<Type>d|f|s)";
string result = Regex.Replace(input,FormatReplacement);
return result;
}
private string FormatReplacement(Match m)
{
string number = m.Groups["Number"].Value;
string type = m.Groups["Type"].Value;
// custom logic here,format as needed
return String.Concat("{",formatCount++,"}");
}
