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})?$/i, the following is a detailed analysis for friends in need.
php example
The following uses PHP as an example:
| 代码如下 | 复制代码 |
| < ?php if (ereg(“/^[a-z]([a-z0-9]*[-_.]?[a-z0-9]+)*@([a-z0-9]*[-_]?[a-z0-9]+)+[.][a-z]{2,3}([.][a-z]{2})?$/i; ”,$email)) { echo “Your email address is correct!”; } else { echo “Please try again!”; } ?> |
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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
The code is as follows
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<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)); }</td> var ee1 = "12xwz@123e^rsrf6.csdfdfom.df";</tr> var ee2 = "12xwz@123ersrf6.csdfdfom.df";</table> Email(ee1); Email(ee2);<p align="left"> </script> Statement of this Website
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