JavaScript 正则表达式 - 仅两个 [az] 后跟三个 [0-9]
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JavaScript regular expression - two [a-z] followed by three [0-9] only
提问by Scott Brown
I've got a simple regular expression:
我有一个简单的正则表达式：
[A-z]{2}[0-9]{3})$/ginside the following:
[A-z]{2}[0-9]{3})$/g在以下内容中：
regForm.submit(function(){
if ($.trim($('#new-usr').val()).match(/([A-z]{2}[0-9]{3})$/g)) {
alert('No');
return false;
}
});
This is correctly reading that something like 'ab123'gives an alert and 'ab1234'doesn't. However, 'abc123'is still throwing the alert. I need it so it's only throwing the alert when it's just 2 letters followed by three numbers.
这是正确的阅读类似的东西'ab123'发出警报而'ab1234'没有。但是，'abc123'还是抛出了警报。我需要它，所以它只在只有 2 个字母后跟三个数字时才会发出警报。
回答by Vlad
Try /^[A-z]{2}[0-9]{3}$/ginstead.
试试吧/^[A-z]{2}[0-9]{3}$/g。
You need to specify that the whole string needs to be matched. Otherwise you get the highlighted part matched: abc123.
您需要指定需要匹配整个字符串。否则，您将匹配突出显示的部分： a bc123。
(I omitted the ()'s, because you don't really need the group.)
（我省略了()'s，因为您并不真正需要该组。）
BTW, are you sure that you want [A-z]and not just [A-Za-z]?
顺便说一句，你确定你想要[A-z]而不仅仅是[A-Za-z]吗？
回答by codaddict
The character class [A-z]is probably not what you need.
字符类[A-z]可能不是您需要的。
Why?
为什么？
The character class [A-z]matches some non-alphabetical characters like [, ]among others.
字符类[A-z]匹配一些非字母字符，例如[，]等等。
JS fiddle linkto prove this.
JS小提琴链接来证明这一点。
This W3school tutorialrecommends it incorrectly.
这个 W3school 教程错误地推荐了它。
If you need only lowercase letters use [a-z]
If you need only uppercase letters use [A-Z]
If you need both use: [a-zA-Z]
如果您只需要使用小写字母[a-z]
如果您只[A-Z]
需要使用大写字母如果您需要同时使用：[a-zA-Z]
If you want to match a string if it has 2 letters followed by 3 digits anywherein the string, just remove the end anchor $from your pattern:
如果你想匹配一个字符串，如果它在字符串中的任何地方有 2 个字母后跟 3 个数字，只需$从模式中删除结束锚点：
[a-z]{2}[0-9]{3}
If you want to match a string if it has 2 letters followed by 3 digits and nothing elseuse both start anchor ^and end anchor $as
如果你想匹配一个字符串，如果它有 2 个字母后跟 3 个数字，没有别的，使用开始锚点^和结束锚点$作为
^[a-z]{2}[0-9]{3}$
回答by sh54
Alternatively you can use:
或者，您可以使用：
/\b([A-z]{2}[0-9]{3})\b/g
if your string contains multiple words and you are trying to match one word.
如果您的字符串包含多个单词并且您正在尝试匹配一个单词。
