正则表达式匹配文件名中的字符串

Question

I am trying to make a list of all PHP files within a directory that have a specific character string (in my case a datestamp) at the beginning of the name AND a specific string ".php" at the end. My date is being passed in as a variable ($SearchDate). I have already successfully set up the PHP script to read in a full list of files from my directory, and was just trying to use preg_match to filter the list for me. Unfortunatly I am a complete failure at RegEx even having tried repeatedly with this cheatsheet .

Here is what I have that is generating errors and no results:

$SearchDate = '2013-02'; //example for february of 2013

if(preg_match('#^('.$SearchDate.')+[:graph:]{1}(\.(pdf))#', $file)) {
   //do something
}

I also tried:

preg_match('#^\Q'.$SearchDate.'\E+[:graph:]{1}\Q.pdf\E#', $file)

My filenames look like this:

2013-02-fileNameMightBeAlphaOr1234567890.pdf

The errors I am getting look like this:

Warning: preg_match() [function.preg-match]: Compilation failed: POSIX named classes are supported only within a class at offset 5 in /home/directory/myfile.php on line 26

Answer 1

I need to also be checking that it ends with ".pdf" so I basically need the start and end of the filename and don't care what happens in the middle.

If that's the case then following regex should work for you:

if(preg_match('#^' . $SearchDate . '.*?\.pdf$#', $file)) {
   //do something
}

Live Demo: http://ideone.com/h66GY0

Answer 2

这个简单的正则表达式应该可行

preg_match('/^'.$SearchDate.'/', $file);

Answer 3

将{和}添加到图表中......就像

     preg_match('#^('.$SearchDate.')+[{:graph:}]{1}(\.(pdf))#', $file)