javascript - 根据提到的要点在javascript中发送电子邮件正则表达式

Question

谁能提供以下条件的正则表达式

1. 用户部分不以“.”开头或结尾性格。
2. 域部分不包含以下无效字符:"#\"%|<>?'`/ ,*&;:£$^!~ ú(){}+"
3. 有效的电子邮件包含“@​​”和“.”字符
4. 有效的电子邮件不包含两个连续的点

目前我正在使用下面的 reg ex

 /^(?!^[.])[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]{2,63})*$/;

提到的正则表达式并非在所有方面都有效。

Answer 1

为了尊重所有这些条件，您需要按顺序处理它们并采用逻辑来编写您的正则表达式，我尝试为您的情况制定合适的解决方案，这就是 the Regex 我想出了:

(?!^[.])[a-zA-Z_\-0-9]+[a-zA-Z_\-0-9.]+(?!\.\.)[^\.]+@(?![#\"%|<>?'`\/ ,*&;:£$^!~ ú(){}+])(?![\.]{2})[a-zA-Z_\-0-9.]+\.[a-zA-Z]{2,3}

演示:

您可以 test this Regex here并在 a working live Demo 中查看也是。

说明:

• 负前瞻 (?!^[.])

Assert that the Regex below does not match ^ asserts position at start of the string Match a single character present in the list below [.] . matches the character . literally (case sensitive)

• 匹配下面列表中的单个字符 [a-zA-Z_\-0-9]+

I added this part to avoid matching the . in the beginning of the regex + Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy) a-z a single character in the range between a and z (case sensitive), A-Z a single character in the range between A and Z _ matches the character _ literally (case sensitive) - matches the character - literally (case sensitive) 0-9 a single character in the range between 0 and 9

• 匹配下面列表中的单个字符 [a-zA-Z_\-0-9.]+

+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy) a-z a single character in the range between a and z (case sensitive), A-Z a single character in the range between A and Z _ matches the character _ literally (case sensitive) - matches the character - literally (case sensitive) 0-9 a single character in the range between 0 and 9, . matches the character . literally (case sensitive)

• 负前瞻 (?!\.\.)

Assert that the Regex below does not match \. matches the character . literally (case sensitive) \. matches the character . literally

• 匹配一个不在下面列表中的字符 [^\.]+

+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy) \. matches the character . literally

• @匹配字符 @从字面上看
• 负前瞻 (?![#\"%|<>?'\/ ,*&;:£$^!~ ú(){}+])

Assert that the Regex below does not match Match a single character present in the list below [#\"%|<>?'/ ,*&;:£$^!~ ú(){}+]`

• 负前瞻 (?![\.]{2})

Assert that the Regex below does not match Match a single character present in the list below [\.]{2}, {2} Quantifier — Matches exactly 2 times \. matches the character . literally

• 匹配下面列表中的单个字符 [a-zA-Z_\-0-9.]+

+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed a-z a single character in the range between a and z (case sensitive), A-Z a single character in the range between A and Z (case sensitive) _ matches the character _ literally (case sensitive) - matches the character - literally (case sensitive) 0-9 a single character in the range between 0 and 9, . matches the character . literally (case sensitive) \. matches the character . literally

• 匹配下面列表中的单个字符 [a-zA-Z]{2,3}

{2,3} Quantifier — Matches between 2 and 3 times, as many times as possible, giving back as needed a-z a single character in the range between a and z (case sensitive), A-Z a single character in the range between A and Z