Javascript正则表达式 - 匹配多个匹配项

Question

我在这里遇到了一个问题。 我试图以匹配字符串中的正则表达式中多次出现，但我没有得到所有出现：

样品：

 s = new RegExp(';' + y[p][0] + '_' + y[p][1] + '_' + y[p][2] + '_([0-9]*);', 'g'); 
     e = null; 
     e = s.exec(grArr); 
     while (e != null) { 
      alert(e[0]+'-'+e[1]+'-'+e[2]); //debugging output 
      r = r + e[0]; //adding results to output var 
      e = s.exec(grArr); 
     } 

Sample variables: 
//to be searched: 
var grArr=';0_0_709711498101583267971121121179999105110111_11994876;0_0_709711498101583267971121121179999105110111_11994877;0_0_709711498101583267971121121179999105110111_11994878;0_0_709711498101583267971121121179999105110111_11994879;0_0_709711498101583268117110107101108103114252110_11994872;0_0_709711498101583268117110107101108103114252110_11994873;0_0_709711498101583268117110107101108103114252110_11994874;0_0_709711498101583268117110107101108103114252110_11994875;0_0_7097114981015832839910411997114122_11994868;0_0_7097114981015832839910411997114122_11994869;0_0_7097114981015832839910411997114122_11994870;0_0_7097114981015832839910411997114122_11994871;0_1_71114246115115101583276_11994870;0_1_71114246115115101583276_11994874;0_1_71114246115115101583276_11994878;0_1_71114246115115101583277_11994869;0_1_71114246115115101583277_11994873;0_1_71114246115115101583277_11994877;0_1_71114246115115101583283_11994868;0_1_71114246115115101583283_11994872;0_1_71114246115115101583283_11994876;0_1_7111424611511510158328876_11994871;0_1_7111424611511510158328876_11994875;0_1_7111424611511510158328876_11994879;' 
//search Pattern: 
y[0][0]='0'; 
y[0][1]='1'; 
y[0][2]='71114246115115101583283'; 

这导致2个OCCURENCES - 不是3，因为它应该是。

Answer 1

问题是，你使用分号两次：一次在正则表达式的开始，一次在结尾。

由于在您的示例中，三个“匹配”彼此直接相关，所以找不到第二个匹配项，因为其前面的分号已经用于上一个匹配项中。

解决方案：在您的正则表达式中使用字边界（'\\b'）而不是​​3210。