PHP kanji alphanumeric underscore regular expression

Source: Internet
Author: User
Keywords Network programming PHP tutorial
Tags comment delete etc expression get network network programming php

PHP Tutorial Chinese Characters Alphanumeric Underlined Regular Expressions

Regular expression matching whitespace characters: ^ s * | s * $
Commentary: Can be used to delete the first line of the first line of the whitespace characters (including spaces, tabs, page breaks, etc.), a very useful expression


$ action = trim ($ _ get ['action']);
if ($ action == "sub")
{
$ str = $ _post ['dir'];
//if(!preg_match("/^[".chr(0a1)."-".chr(0ff)."a-za-z0-9_]+$/",$str)) // gb2312 Chinese character letters Number underlined regular expression
if (! preg_match ("/ ^ [x {4e00} -x {9fa5} a-za-z0-9 _] + $ / u", $ str)) // utf-8 Kanji alphanumeric underscore Regular expression
{
echo "<font color = red> The typed [". $ str. "] you entered contains an illegal character </ font>";
}
else
{
echo "<font color = green> The typed [". $ str. "] you entered is perfectly legal, via! </ font>";
}
}
?>
<form method = "post" action = "">
Enter characters (numbers, letters, Chinese characters, underline):
<input type = "text" name = "dir" value = "">
<input type = "submit" value = "Submit">
</ form>


The regular expression matching url url: [a-za-z] +: // [^ s] *
Commentary: The function of the online version is very limited, the above can meet the needs of the basic match account is legitimate (the beginning of the letter, allowing 5-16 bytes, allowing the alphanumeric underscore): ^ [a-za- z0-9 _] {4,15} $
Commentary: Form validation is very useful when matching domestic phone numbers: d {3} -d {8} | d {4} -d {7}
Commentary: Matches such as 0511-4405222 or 021-87888822
Match Tencent qq number: [1-9] [0-9] {4,}
Commentary: Tencent qq number starting from 10000 match China Post Code: [1-9] d {5} (?! d)
Commentary: China postal code is 6 digits matching ID: d {15} | d {18}
Commentary: China's ID card for 15 or 18 match ip address: d +. D +. D +. D +
Commentary: Useful when extracting ip addresses

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.