WebPhp 用preg_匹配检查POST,php,forms,preg-match,Php,Forms,Preg Match,可能重复： 我将帖子检索到标准表单，需要测试两件事： 该值必须为40个字符 该值必须仅包含字母和数字 我认为使用preg_match可以做到这一点，但我不知道如何做到。 WebAug 1, 2016 · ctype_alnum () is a godsend for quick and easy username/data filtering when used in conjunction with str_replace (). Let's say your usernames have dash (-) and underscore (_) allowable and alphanumeric digits as well. Instead of a regex you can trade a bit of performance for simplicity:
Allow only [a-z][A-Z][0-9] in string using PHP - Stack …
WebFeb 4, 2014 · For example if I give the string "{}\" the code inside your if statement will execute. But your comment inside the if statement // string contains only english letters & digits indicates that you want the code inside the if statement to execute only if the string contains a-z A-Z or 0-9, however by using the ! your code does the opposite. WebSep 9, 2014 · In order to make sure no code can be inserted I wanted to use ctype_alnum to validate all table names (after removing underscores) that come into the database module to shield the application from errors in other parts. oomph phone
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WebJun 7, 2024 · PHP ctype_alnum() (Check for Alphanumeric) Article Contributed By : jit_t. @jit_t. Vote for difficulty. Easy Normal Medium Hard Expert. Article Tags : PHP-function; PHP; Web Technologies; Practice Tags : PHP; Report Issue. Courses. 104k+ interested Geeks. Full Stack Development with React & Node JS - Live. WebJul 2, 2010 · It's probably a better idea to use the builtin functions: ctype_alnum Share Improve this answer Follow edited Dec 3, 2024 at 18:26 Jeff Puckett 36.3k 17 120 165 answered Jul 2, 2010 at 3:16 Jani Hartikainen 42.4k 10 66 84 1 I'd go with this and avoid the unnecessary overhead of regular expressions. – casablanca Jul 2, 2010 at 3:19 2 WebCtype Functions Table of Contents. ctype_alnum — Check for alphanumeric character(s); ctype_alpha — Check for alphabetic character(s); ctype_cntrl — Check for control character(s); ctype_digit — Check for numeric character(s); ctype_graph — Check for any printable character(s) except space; ctype_lower — Check for lowercase character(s); … iowa city outdoor dining