javascript - 允许在 2 个字母数字之间使用可选连字符并限制空格的模式

Question

sub:允许在 2 个字母数字之间使用可选连字符并限制空格的模式。没有其他特殊字符

我需要一个正则表达式来匹配以下测试用例:-

"all-owed" "allowe-d" "a-llo-wed-12" "allowed12" "allow-12ed" "allowed-12" "allo-wed-12"

"not allowed" "not allowed " " notallowed" " nota-llowed" "not--allowed" "not@allowed"

尝试过的模式:

^[^-]*-?[^-]*$
^\\w+(-\\w+)*$

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Answer 1

你的第二个正则表达式 ^\w+(-\w+)*$会匹配您的大小写，但 \w 也会匹配下划线。

也许您正在寻找一种与字母数字 [a-z0-9]+ 匹配一次或多次的模式，然后重复匹配破折号，后跟与字母数字 匹配一次或多次>(?:-[a-z0-9]+)*

请注意，这仅匹配小写字符。您可以使用不区分大小写的标志来匹配大写和小写字符。

^[a-z0-9]+(?:-[a-z0-9]+)*$

const strings = [
  "all-owed",
  "allowe-d",
  "a-llo-wed-12",
  "allowed12",
  "allow-12ed",
  "allowed-12",
  "allo-wed-12",
  "notallo-wed-12_",
  "not allowed",
  "not allowed ",
  " notallowed",
  " nota-llowed",
  "not--allowed",
  "not@allowed"
];
let pattern = /^[a-z0-9]+(?:-[a-z0-9]+)*$/;

strings.forEach((s) => {
  console.log(s + " ==> " + pattern.test(s));
});