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
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