php 用于查找有效文件名的正则表达式
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Regex for finding valid filename
提问by OrangeRind
I want to check whether a string is a file name (name DOT ext) or not.
我想检查一个字符串是否是文件名（名称 DOT ext）。
Name of file cannot contain / ? * : ; { } \
文件名不能包含 / ? * : ; { } \
Could you please suggest me the regex expression to use in preg_match()?
你能建议我在 preg_match() 中使用的正则表达式吗？
回答by RichieHindle
Here you go:
干得好：
"[^/?*:;{}\]+\.[^/?*:;{}\]+"
"One or more characters that aren't any of these ones, then a dot, then some more characters that aren't these ones."
“一个或多个不是这些字符的字符，然后是一个点，然后是一些不是这些字符的字符。”
(As long as you're sure that the dot is really required - if not, it's simply: "[^/?*:;{}\\]+"
（只要您确定确实需要该点-如果不是，则很简单： "[^/?*:;{}\\]+"
回答by hegemon
$a = preg_match('=^[^/?*;:{}\\]+\.[^/?*;:{}\\]+$=', 'file.abc');
^ ... $ - begin and end of the string
[^ ... ] - matches NOT the listed chars.
回答by Tomalak
The regex would be something like (for a three letter extension):
正则表达式类似于（对于三个字母的扩展名）：
^[^/?*:;{}\]+\.[^/?*:;{}\]{3}$
PHP needs backslashes escaped, and preg_match()needs forward slashes escaped, so:
PHP 需要转义反斜杠，preg_match()需要转义正斜杠，所以：
$pattern = "/^[^\/?*:;{}\\]+\.[^\/?*:;{}\\]{3}$/";
To match filenames like "hosts"or ".htaccess", use this slightly modified expression:
要匹配像"hosts"或".htaccess"这样的文件名，请使用这个稍微修改的表达式：
^[^/?*:;{}\]*\.?[^/?*:;{}\]+$
回答by user3627897
Below the regex using for checking Unix filename in a Golang program :
在 Golang 程序中用于检查 Unix 文件名的正则表达式下方：
reg := regexp.MustCompile("^/[[:print:]]+(/[[:print:]]+)*$")
