php preg_match 匹配错误的主题？
我真的不明白为什么，但是 PHP preg_match 在某些主题中匹配了错误的主题。
例如，在这 4 行中，我希望得到“匹配 2”作为输出，但我得到的都是匹配的（匹配 1 到 4）
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'arnesdemanoTh.php'))
echo 'match 1';
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'arnesdemanoTh.swf'))
echo 'match 2';
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'arnesdemanoTh1.gif'))
echo 'match 3';
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'arnesdemanoTh2.gif'))
echo 'match 4';
在这种情况下，我得到“匹配 2”作为输出，正如预期的
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'bang.php'))
echo 'match 1';
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'bang.swf'))
echo 'match 2';
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'bang1.gif'))
echo 'match 3';
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'bang2.gif'))
echo 'match 4';
那样做错了吗？
非常感谢指教！
I really don't understand why, but PHP preg_match is matching wrong subjects in certain ones.
For instance, in this 4 lines, i expect to get "match 2" as output, but i get all as matched instead (match 1 through 4)
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'arnesdemanoTh.php'))
echo 'match 1';
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'arnesdemanoTh.swf'))
echo 'match 2';
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'arnesdemanoTh1.gif'))
echo 'match 3';
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'arnesdemanoTh2.gif'))
echo 'match 4';
In this case, i get "match 2" as output, just as expected
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'bang.php'))
echo 'match 1';
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'bang.swf'))
echo 'match 2';
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'bang1.gif'))
echo 'match 3';
if (preg_match("/.bin|.d64|.dcr|.gb|.gbc|.htm|.html|.nes|.prg|.sna|.swf|.z80/i", 'bang2.gif'))
echo 'match 4';
What i'm doing wrong?
Thanks a lot in advise!
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评论（3）
您需要通过在“.”（点）前面添加反斜杠来转义它，ex \.
You need to escape the "." (dot) by putting a backslash before it, ex \.
您需要转义句号，
\.而不是.。否则，.匹配任何字母，因此“arnes”匹配.nes。You need to escape your periods,
\.instead of.. Otherwise the.matches any letter, so "arnes" matches.nes.你需要逃避“。”因为它会匹配任何字符。因此，请使用 \.bin 而不是“.bin”。在第一组行中，文件名与 .nes 匹配。
you need to escape the "." since it will match any character. so instead of ".bin" use \.bin. in the first set of lines, the name of the file matches with .nes.