10个实用的php正则表达式汇总
1. 验证E-mail地址
用于验证电子邮件的正则表达式。但它并不是高效、完美的解决方案。在此不推荐使用。
复制代码 代码示例:
$email = "test@ansoncheung.tk";
if (preg_match('/^[^0-9][a-zA-Z0-9_]+([.][a-zA-Z0-9_]+)*[@][a-zA-Z0-9_]+([.][a-zA-Z0-9_]+)*[.][a-zA-Z]{2,4}$/',$email)) {
echo "Your email is ok.";
} else {
echo "Wrong email address format";
}
为了更加有效验证电子邮件地址,推荐使用filer_var 。
复制代码 代码示例:
if (filter_var('test+email@ansoncheung', FILTER_VALIDATE_EMAIL)) {
echo "Your email is ok.";
} else {
echo "Wrong email address format.";
}
2. 验证用户名
用于验证用户名的实例,其中包括字母、数字(A-Z,a-z,0-9)、下划线以及最低5个字符,最大20个字符。同时,也可以根据需要,对最小值和最大值做合理的修改。
复制代码 代码示例:
$username = "user_name12";
if (preg_match('/^[a-zd_]{5,20}$/i', $username)) {
echo "Your username is ok.";
} else {
echo "Wrong username format.";
}
3. 验证电话号码
验证美国电话号码的实例。
复制代码 代码示例:
$phone = "(021)423-2323";
if (preg_match('/(?d{3})?[-s.]?d{3}[-s.]d{4}/x', $phone)) {
echo "Your phone number is ok.";
} else {
echo "Wrong phone number.";
}
4. 验证IP地址
用来验证IPv4地址的实例。
复制代码 代码示例:
$IP = "198.168.1.78";
if (preg_match('/^(([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]).){3}([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$/',$IP)) {
echo "Your IP address is ok.";
} else {
echo "Wrong IP address.";
}
5. 验证邮政编码
用来验证邮政编码的实例。
复制代码 代码示例:
$zipcode = "12345-5434";
if (preg_match("/^([0-9]{5})(-[0-9]{4})?$/i",$zipcode)) {
echo "Your Zip code is ok.";
} else {
echo "Wrong Zip code.";
}
6. 验证SSN(社会保险号)
验证美国SSN的实例。
复制代码 代码示例:
$ssn = "333-23-2329";
if (preg_match('/^[d]{3}-[d]{2}-[d]{4}$/',$ssn)) {
echo "Your SSN is ok.";
} else {
echo "Wrong SSN.";
}
7. 验证信用卡号
复制代码 代码示例:
$cc = "378282246310005";
if (preg_match('/^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6011[0-9]{12}|3(?:0[0-5]|[68][0-9])[0-9]{11}|3[47][0-9]{13})$/', $cc)) {
echo "Your credit card number is ok.";
} else {
echo "Wrong credit card number.";
}
8. 验证域名
复制代码 代码示例:
$url = "http://ansoncheung.tk/";
if (preg_match('/^(http|https|ftp)://([A-Z0-9][A-Z0-9_-]*(?:.[A-Z0-9][A-Z0-9_-]*)+):?(d+)?/?/i', $url)) {
echo "Your url is ok.";
} else {
echo "Wrong url.";
}
9. 从特定URL中提取域名
复制代码 代码示例:
$url = "http://ansoncheung.tk/articles";
preg_match('@^(?:http://)?([^/]+)@i', $url, $matches);
$host = $matches[1];
echo $host;
10. 将文中关键词高亮显示(这个值得收藏)
复制代码 代码示例:
$text = "Sample sentence from AnsonCheung.tk, regular expression has become popular in web programming. Now we learn regex. According to wikipedia, Regular expressions (abbreviated as regex or regexp, with plural forms regexes, regexps, or regexen) are written in a formal language that can be interpreted by a regular expression processor";
$text = preg_replace("/b(regex)b/i", '<span style="background:#5fc9f6">1</span>', $text);
echo $text;
以上就是10个php正则表达式的例子,希望对大家有所帮助。