带有 preg_replace 的 PHP 过滤器只允许使用字母
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PHP filter with preg_replace allow only letters
提问by Master345
I have a little problem with preg_replace. I need a function that converts all characters to nothing except [A-z][0-9]and some . ! ?
我对 preg_replace 有点问题。我需要一个函数将所有字符转换为空字符，除了[A-z][0-9]一些. ! ?
I could do a preg_match, but this only verify, and I want to be replaced. This for not putting junk characters like
<p>and ;[[;[p;[in description META TAG.
我可以做一个preg_match，但这只是验证，我想被替换。这不把垃圾字符像
<p>和;[[;[p;[在描述元标记。
So the script must be like:
所以脚本必须是这样的：
;")<br>kk23?! => brkk23?!
;")<br>kk23?! => brkk23?!
Any help would be appreciated :D
任何帮助将不胜感激：D
回答by dang
$string = ';")<br>kk23?!';
$new_string = preg_replace("/[^A-Za-z0-9?!]/",'',$string);
echo $new_string;
leave- letters, numbers, spaces, ?!
离开 - 字母，数字，空格，？！
/* 3 choices. Pick one you like! */
$str = preg_replace("/[^A-Za-z0-9?! ]/","",$str);
$str = preg_replace("/[^A-Za-z0-9?!\s]/","",$str);
$str = preg_replace("/[^A-Za-z0-9?![:space:]]/","",$str);
回答by RiaD
$var=preg_replace('~[^A-Za-z0-9?.!]~','',$var);
Don't forget A-Za-zand A-zare not same
不要忘记A-Za-z和A-z不一样
回答by Aditya P Bhatt
A quick solution will be as below also:
一个快速的解决方案也如下：
if (preg_match('/^[\w\.]+$/', $str)) {
echo 'Str is valid';
} else
echo 'Str is invalid';
// string only contain the a to z , A to Z, 0 to 9 and _ (underscore)
// 字符串只包含 a 到 z 、A 到 Z、0 到 9 和 _（下划线）
\w - matches [a-zA-Z0-9_]+
Hope it helps.
希望能帮助到你。
回答by Ben
The easiest way is to just do something similar to:
Just add the characters after the !, make sure to escape them if needed.
最简单的方法是做类似的事情：只需在 之后添加字符!，确保在需要时将它们转义。
$string = "<br>kk23?!";
$string = preg_replace('/[^A-Za-z0-9 \?!]/', '', $string);
回答by user3706926
More visit to this page. I think more people getting the same problem. The better way is to try your self and get what you need. Custom yours or copy paste this php and try it :
更多访问此页面。我认为更多的人遇到同样的问题。更好的方法是尝试自己并获得所需的东西。自定义您的或复制粘贴此 php 并尝试：
$sample_input = '&&*9?><<script>}cat-<html>ch(_P.,,mE.:;xc##e*p32t.ion $e){di+-($e->ge69tMesPHP _f0sage()3);}';
$output = ereg_replace("[^..........]", "", $sample_input);
echo "validate =".$output;
modify by filling this to get what you want :
通过填写此内容进行修改以获得您想要的内容：
$output = ereg_replace("[^.........]", "", $sample_input);
Example : if you want only lowercase then do like this :
示例：如果你只想要小写，那么这样做：
$output = ereg_replace("[^a-z]", $sample_input);
lower case with white space :
带空格的小写：
$output = ereg_replace("[^a-z ]", $sample_input);
and more....., This is a simple validation method :
还有更多.....，这是一个简单的验证方法：
$username = ereg_replace("[^A-Z0-9_]", "", $username);
$fullname = ereg_replace("[^A-Za-z0-9., ]", "", $fullname);
$city = ereg_replace("[^A-Za-z -]", "", $city);
$phone = ereg_replace("[^0-9 +()-]", "", $phone);
$state = ereg_replace("[^A-Za-z -]", "", $state);
$zipcode = ereg_replace("[^0-9]", "", $zipcode);
$country = ereg_replace("[^A-Za-z -]", "", $country);
$gender = ereg_replace("[^mf]", "", $gender);
Try yourself, hope will help...
自己试试，希望能帮到你。。。
