Javascript正则表达式匹配5或9位数的邮政编码 [英] Javascript Regular Expression to match 5 or 9 digit zipcode

问题描述

我有一个与我最近的帖子类似的问题，但有一个邮政编码验证器，我试图转换为javascript验证过程。我的脚本如下：

I have a similar issue as my recent post but with a zip code validator i am trying to convert over to a javascript validation process. my script looks like so:

    var regPostalCode = new RegExp("\\d{5}(-\d{4})?");
    var postal_code = $("input[name='txtzipcode']").val();
    if (regPostalCode.test(postal_code) == false) {
        bValid = false;
        msg = msg + '<li>Invalid Zip Code.</li>';
    }

从我最近的帖子中我了解到我在开始时需要的转义字符。基本上这个函数验证的是一个22621的邮政编码是正确的，但它不应该验证22601-1。破折号后应该有2位数字，如22601-9999。这就像验证的第二部分总是如此。这个表达对我来说再次起作用。我错过了什么吗？是否需要另一个转义字符？

From my recent post I learned of the escape character that I needed at the beginning. Basically this function is validating a zip code that is say 22601 which is correct, but it shouldn't validate 22601-1. There should have to be 4 digits after the dash like 22601-9999. It's like the second part of the validation is always true. Again this expression has worked in the past for me. Am I missing something? Is another escape character needed?

推荐答案

添加锚点：新的RegExp（^ \\d {5}（ - \\d {4}）？$）。这会强制正则表达式引擎仅接受匹配，如果它从字符串的第一个字符开始（ ^ ）并在字符串的结尾处结束（ $ ）匹配。

Add anchors: new RegExp("^\\d{5}(-\\d{4})?$"). This forces the regular expression engine to only accept a match, if it begins at the first character of the string (^) and ends at the end of the string ($) being matched.

注意，您在问题中给出的正则表达式中可能存在拼写错误：第二个 \d 缺少一个反斜杠。

Note, that there might be a typo in the regular expression you hav given in your question: the second \d is missing a backslash.

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