如何使用 PHP 的 preg_match 来验证字符串？
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How do I use PHP's preg_match to validate strings?
提问by OrangeRind
Please tell me how to use the various symbols used for expression matching in preg_matchfunction of PHP.
请告诉我如何使用preg_matchPHP函数中用于表达式匹配的各种符号。
Besides basic information, please give example for checking a valid e-mail address and a string that should not contain / : ; { } * &
除了基本信息，请举例检查一个有效的电子邮件地址和一个不应包含 / : 的字符串。{ } * &
回答by Fábio Antunes
Simple example.. Verifying $var which is a string verifying and checking for (a to z AND A to Z) characters.
简单示例.. 验证 $var 这是一个字符串，用于验证和检查（a 到 z 和 A 到 Z）字符。
<?php
$var = 'hello';
if (ereg("[a-zA-Z]", $var)) {
echo 'it was typed correctly';
} else {
echo 'it was not typed correctly';
}
?>
more regular expressions syntax exemples: http://www.regexlib.com/
更多正则表达式语法示例：http: //www.regexlib.com/
EDIT:
编辑：
if (ereg("^([0-9,a-z,A-Z]+)([.,_]([0-9,a-z,A-Z]+))*[@]([0-9,a-z,A-Z]+)([.,_,-]([0-9,a-z,A-Z]+))*[.]([0-9,a-z,A-Z]){2}([0-9,a-z,A-Z])?$", $email)) {
echo 'email ok';
} else {
echo 'email not ok';
}
Regards.
问候。
回答by Copas
Jeff Atwoodrecently had an article on his coding horror blogabout regular expressions. Check out "Regular Expressions for Regular Programmers".
Jeff Atwood最近在他的编码恐怖博客上发表了一篇关于正则表达式的文章。查看“常规程序员的正则表达式”。
回答by merkuro
To check for a valid mail you can either use build in functionality (filter_var()/FILTER_VALIDATE_EMAIL) or use nice ready to use libraries which are compliant to the current RFC. PHP : Parsing Email Adresses in PHP. For examples on preg_match()you can go to the php website and a full list regular expression options is available on Wikipedia. To learn about Regex I recommend "The Regex Coach".
要检查有效邮件，您可以使用内置功能（filter_var()/FILTER_VALIDATE_EMAIL）或使用符合当前 RFC 的现成可用的库。PHP：在 PHP 中解析电子邮件地址。有关preg_match() 的示例，您可以访问 php 网站，维基百科上提供了完整的正则表达式选项列表。要了解 Regex，我推荐“ The Regex Coach”。
回答by Sinan ünür
I know the question is about PHP, but my purpose is to illustrate the intricacies of email address validation: To check if an email address conforms to RFC 2822, you can use the Perl module Email::Address. Do take a look at the source of that module as well as the RFC.
我知道这个问题是关于 PHP 的，但我的目的是说明电子邮件地址验证的复杂性：要检查电子邮件地址是否符合RFC 2822，您可以使用 Perl 模块Email::Address。请查看该模块的来源以及 RFC。
回答by Sinan ünür
If I give $var = 'hello87%^$' also returning "it was typed correctly";
如果我给 $var = 'hello87%^$' 也返回“输入正确”；
