Regular expression to match email address in php_PHP tutorial

An example of a regular expression for matching email addresses in PHP. The regular matching expression I commonly use when replacing email addresses: /^[a-z]([a-z0-9]*[-_]?[a-z0 -9]+)*@([a-z0-9]*[-_]?[a-z0-9]+)+[\.][a-z]{2,3}([\.][a-z ]{2})?$/i, the following is a detailed analysis for friends in need.

php example

The following uses PHP as an example:

代码如下	复制代码
if (ereg(“/^[a-z]([a-z0-9]*[-_.]?[a-z0-9]+)*@([a-z0-9]*[-_]?[a-z0-9]+)+[.][a-z]{2,3}([.][a-z]{2})?$/i; ”,$email)) {    echo “Your email address is correct!”; } else {    echo “Please try again!”; } ?>

Description:
①/content/i forms a case-insensitive regular expression; ^ starts the match; $ ends the match.

②[a-z] E-Mail prefix must start with an English letter

③([a-z0-9]*[-_]?[a-z0-9]+)* matches _a_2, aaa11, _1_a_2, but does not match a1_, aaff_33a_, a__aa, if it is a null character , is also matched, * means 0 or more.

④* represents 0 or more preceding characters.

⑤[a-z0-9]* matches 0 or more English letters or numbers; [-_]? matches 0 or 1 "-", because "-" cannot appear continuously.

⑥[a-z0-9]+ matches 1 or more English letters or numbers, because "-" cannot be used as the end

⑦@ There must be someone @

⑧([a-z0-9]*[-_]?[a-z0-9]+)+ See above ([a-z0-9]*[-_]?[a-z0-9 ]+)* explanation, but it cannot be empty, + means one or more.

⑨[.] treats special characters (.) as ordinary characters; [a-z]{2,3} matches 2 to 3 English letters, usually com or net, etc.
⑩([.][a-z]{2})? Matches 0 or 1 [.][a-z]{2} (such as .cn, etc.) I don’t know if the last part of .com.cn is usually two bit, if not, please change {2} to {number of starting words, number of ending words}

js example

var ee1 = "12xwz@123e^rsrf6.csdfdfom.df"; var ee2 = "12xwz@123ersrf6.csdfdfom.df";

The code is as follows

代码如下	复制代码
<script><br /> function Email(ee){<br /> var emailreg = "^w+@w+.w+(.w+)*$";</script> var rege = new RegExp(emailreg, 'g'); alert(rege.test(ee)); } var ee1 = "12xwz@123e^rsrf6.csdfdfom.df"; var ee2 = "12xwz@123ersrf6.csdfdfom.df"; Email(ee1); Email(ee2);

Copy code

<script><br /> function Email(ee){<br /> var emailreg = "^w+@w+.w+(.w+)*$";<br /> <br />var rege = new RegExp(emailreg, 'g');<br /> alert(rege.test(ee)); }</script>

Email(ee1); Email(ee2);

In order for you to better master regular expressions, please learn the string escape form Here, you use a string to represent the regular expression, and the escape character must be expressed. If you want to match, use ^w+@w+.w+(.w+)*$ It starts with w word and has one or more @后 It’s a word .followed by a word with one or more (.w+)* can have none or multiple

http://www.bkjia.com/PHPjc/633085.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/633085.htmlTechArticleAn example of a regular expression for matching email addresses in PHP. Regular expressions for replacing regular email addresses. My commonly used regular matching expressions: /^[a-z]([a-z0-9]*[-_]?[a-z0-9]+)*@([a-z0-9]*[-_]?[a-z0-9 ]+)+[\.][a-z...