preg_replace：错误的正则表达式==“未知修饰符”？
我正在编造虚假的电子邮件地址，我只是想确保它们采用有效的电子邮件格式，因此我尝试删除不在以下设置中的任何字符：
$jusr['email'] = preg_replace('/[^a-zA-Z0-9.-_@]/g', '', $jusr['email']);
我在 Windows 计算机上没有遇到任何问题，但在 Linux 开发服务器上，每次运行此代码时我都会收到此错误：
Warning: preg_replace() [function.preg-replace]: Unknown modifier 'g' in /var/www/vhosts/....
我认为这是正则表达式字符串，但我无法确定它。帮助不大？谢谢。
澄清：我并不是想容纳所有有效的电子邮件地址（这对我的目的来说是不必要的），我只是需要找出我的 preg_replace 正则表达式出了什么问题。
I'm making up fake email addresses and I just want to make sure they are in a valid email format so I'm trying to remove any character that is not in the set below:
$jusr['email'] = preg_replace('/[^a-zA-Z0-9.-_@]/g', '', $jusr['email']);
I haven't had any trouble on my windows machine, but on the linux dev server I get this error each time this code runs:
Warning: preg_replace() [function.preg-replace]: Unknown modifier 'g' in /var/www/vhosts/....
I think it's the regex string, but I can't pin it down. Little help? Thanks.
Clarification: I'm not trying to accommodate all valid email addresses (unnecessary for my purpose), I just need to figure out what's wrong with my preg_replace regex.
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g不是 PCRE（PHP 使用的正则表达式实现）中的有效修饰符，因为根本不需要它；preg_replace()默认情况下将执行全局替换。您会在真正的 Perl 正则表达式和 JavaScript 正则表达式中找到该修饰符，但在 PCRE 中找不到。只需删除
g：gis not a valid modifier in PCRE (the regex implementation PHP uses) because it's simply not needed;preg_replace()will perform global replacements by default. You'll find the modifier in true Perl regex as well as JavaScript regex, but not in PCRE.Just drop the
g:您的 PCRE 修饰符无效。以下是有效 PCRE 修饰符的列表：
http://us. php.net/manual/en/reference.pcre.pattern.modifiers.php
g（全局）修饰符默认启用，因此您不需要不需要它。You have an invalid PCRE modifier. Here is the list of valid PCRE modifiers:
http://us.php.net/manual/en/reference.pcre.pattern.modifiers.php
The
g(global) modifier is on by default, so you don't need it.问题是
g不是 有效的 PCRE 修饰符。尝试查看 preg_match_all。The problem is that
gis not a valid PCRE modifier. Try looking at preg_match_all.除了 /g 之外，正则表达式的内部部分似乎也无效：
首先，“^”（输入开始元字符）在 [...] 内部没有任何意义（除非您允许包含“^”的电子邮件地址）。其次，破折号应该被转义或放在组的末尾，否则它将被视为范围运算符。最重要的是，您的表达式不允许使用各种完全有效的电子邮件地址。查看一些示例。
In addition to /g, the inner part of your regexp doesn't seem to be valid either:
First, the "^" (which is start-of-input metachar) makes no sense inside [...] (unless you allow email adresses that contain "^"). Second, the dash should be escaped or put to the end of the group, otherwise it will be treated as range operator. And most important, your expression disallows a wide range of perfectly valid email addresses. Check some examples.