正则表达式的,请大家来聊聊
如下: 
 上海[1,3],北京[   2,4,5],山东     
 就上次用一个字符中,要找到的是    
 [1,3] 
 [   2,4,5]   
 这两个,条件就是   有[]而[]里又要含有数字的,(只要是数字就可以了,不理是多少) 
 谢谢
------解决方案--------------------string str = @ "上海[1,3],北京[ 2,4,5],山东 "; 
 string pattern = @ "\[\s*\d(?:,\s*\d)*\] "; 
 Regex regex = new Regex(pattern); 
 MatchCollection mc = regex.Matches(str); 
 foreach (Match m in mc) 
     Console.WriteLine(m.Value);
------解决方案--------------------试下   
 string yourStr = richTextBox1.Text; 
 MatchCollection mc = Regex.Matches(yourStr, @ "\[(\s*\d,?)*?\] "); 
 foreach (Match m in mc) 
 { 
    richTextBox2.Text += m.Value +  "\n ";  //提取内容 
 }
------解决方案--------------------yufenfeila没有考虑[ 13 , 4 , 5 ]和[11,3]的情况   
 string str = @ "上海[11,3],北京[ 2,4,5],山东[1],天津[ 13 , 4 , 5 ] [] "; 
 string pattern = @ "\[\s*\d(\s*,\s*\d\s*)*\] "; 
 Regex regex = new Regex(pattern); 
 MatchCollection mc = regex.Matches(str); 
 foreach (Match m in mc) 
     Console.WriteLine(m.Value); 
------解决方案--------------------确实少考虑了一些情况,严谨点的   
 string yourStr = richTextBox1.Text; 
 MatchCollection mc = Regex.Matches(yourStr, @ "\[(\s*\d+\s*,?)+?\] "); 
 foreach (Match m in mc) 
 { 
    richTextBox2.Text += m.Value +  "\n ";  //提取内容 
 }