PHP regular unknown modifier error resolution

Source: Internet
Author: User
Keywords Web Programming PHP Tutorials
Tags class echo error modifier php programming web

The following are:

$a = ' 2<span><nobr>tóng<span class= ' h ' >dòng</span></nobr><br> dong </span>3 ' ;
echo preg_replace ('/<span class= "h" >[^<]*?</span>/', ", $a);

Will prompt:

Warning:preg_replace (): Unknown modifier ' P ' in e:phplearntest.php on line 12

The reason is:

In regular mode, use/do delimiters, but also include/in regular, so this error occurs, PHP mistakenly when the next </span> in the trailing slash is the end of the delimiter.

Solution:

1, plus an escape character:

echo preg_replace ('/<span class= "h" >[^<]*?</span>/', ", $a);

2. Change other delimiters:

Echo preg_replace (' {<span class= "H" >[^<]*?</span>} ', ', $a);

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