正则表达式写法php,10种常见的实用PHP正则表达式的写法

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我是靠谱客的博主可靠春天，最近开发中收集的这篇文章主要介绍正则表达式写法php,10种常见的实用PHP正则表达式的写法，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

做程序的人们伤不起，被网上叫做“程序猿”，真是躺着也中枪。但是程序工作说实话，的确是挺麻烦的事情。如果能掌握其中的要领，或是有据可循，可能会事半功倍。下面小编就给大家搜罗了10种常见的实用PHP正则表达式的写法，希望会有所帮助。

1. 验证E-mail地址

这是一个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。

Php代码

$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";

}

$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";

}

Php代码

if (filter_var('test+email@ansoncheung', FILTER_VALIDATE_EMAIL)) {

echo "Your email is ok.";

} else {

echo "Wrong email address format.";

}

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

这是一个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。

Php代码

$username = "user_name12";

if (preg_match('/^[a-zd_]{5,20}$/i', $username)) {

echo "Your username is ok.";

} else {

echo "Wrong username format.";

}

$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

这是一个验证美国电话号码的实例。

Php代码

$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.";

}

$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

这是一个用来验证IPv4地址的实例。

Php代码

$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.";

}

$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

这是一个用来验证邮政编码的实例。

Php代码

$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.";

}

$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)

这是一个验证美国SSN的实例。

Php代码

$ssn = "333-23-2329";

if (preg_match('/^[d]{3}-[d]{2}-[d]{4}$/',$ssn)) {

echo "Your SSN is ok.";

} else {

echo "Wrong SSN.";

}

$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

Php代码

$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.";

}

$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

Php代码

$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.";

}

$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

Php代码

$url = "http://ansoncheung.tk/articles";

preg_match('@^(?:http://)?([^/]+)@i', $url, $matches);

$host = $matches[1];

echo $host;

$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

Php代码

$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", '1', $text);

echo $text;