正则表达式 匹配 占位符

string str1="{0:N2}你好{1:N2}吗{2:N2}大家{3:N2}都{4:N2}好{5:N2}吗{C}{0}{1:C}{C123}{123:C}{123C}"

MatchCollection match = Regex.Matches(str1, @"\{(\d\:[^}]+|\d)+\}");

if (match != null && match.Count > 0)
{
for (int i = 0; i < match.Count; i++)
{

Console.WriteLine(match[i].Value);
}
}

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结果

{0:N2}
{1:N2}
{2:N2}
{3:N2}
{4:N2}
{5:N2}
{0}
{1:C}
{123:C}