Question

我在这里遇到问题。我正在尝试匹配字符串中正则表达式的多个出现，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次出现 - 不应该是3次。

Answer 1

问题是你使用分号两次：一次是在正则表达式的开头，一次是在结束时。

由于在您的示例中，三个“匹配”直接相互跟随，因此找不到第二个匹配项，因为它的前一个分号已在上一个匹配中使用过。

解决方案：在正则表达式中使用字边界（'\\b'）而不是';'。

Javascript正则表达式 - 匹配多个匹配项

1 个答案: