Solution to PHP regular Unknown Modifier error_PHP tutorial

The following regular rules:

$a='2tóngdòng
垌3';
echo preg_replace('/[^<]*?/','',$a);

will prompt:

Warning: preg_replace(): Unknown modifier 'p' in E:phpLearntest.php on line 12

The reason is:

In the regular pattern, / is used as the delimiter, but the regular pattern also contains /, so this error will occur. PHP mistakenly thinks that the slash in the following is the end delimiter.

Solution:

1. Add an escape character:

echo preg_replace('/[^<]*?/','',$a);

2. Change other delimiters: such as

echo preg_replace('{[^<]*?}','',$a);

http://www.bkjia.com/PHPjc/321409.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/321409.htmlTechArticleThe following regular rules: $a='2spannobrtóngspan class="h"dòng/span/nobrbr垌/span3'; echo preg_replace('/span class="h"[^]*?/span/','',$a); will prompt: Warning: preg_replace(): Unknown mo...