简单的数字正则表达式匹配

Question

Hi I'm having an issue doing a simple numeric match, what am I doing wrong: 嗨，我在执行简单的数字匹配时遇到问题，我在做什么错：

Criteria: 标准：

1) Always anchor to start
2) Always Numeric 6-7 digits
3) Always Followed by _ (underscore)

Sample: (want to match everything before LoremIpsum) 样本：（想匹配LoremIpsum之前的所有内容）

1212384_LoremIpsum...
1266625_LoremIpsum...
234233_LoremIpsum...
2348199_LoremIpsum...

I have tried a couple of things: (Does not Match) 我尝试了几件事：（不匹配）

^[\d]{6-7}_
^[0-9]{6-7}_

If I do: 如果我做：

^[\d]{6}_
^[0-9]{7}_

I get matches, why can't I do variable length in this expression ? 我得到匹配项，为什么不能在此表达式中执行可变长度？ What am I missing here ? 我在这里想念什么？

Thanks ! 谢谢！

Answer 1

The correct syntax is with a comma: 正确的语法是逗号：

{6,7}

Not: 不：

{6-7}

Also, you don't have to put the \\d in brackets: 另外，您不必将\\d放在方括号中：

^\d{6,7}_