问题
Possible Duplicate:
preg_match() Unknown modifier '[' help
I am trying to match this pattern
$regex_pattern = '<td id="(\w+)" class="(\w+)">(\w+).com<\/td>';
preg_match_all($regex_pattern, $result, $matches);
print_r($matches);
But I am getting this error: Warning: preg_match_all(): Unknown modifier '(' in
What's wrong in my regex pattern?
回答1:
Add delimiters to your pattern
When using the PCRE functions, it is required that the pattern is enclosed by delimiters. A delimiter can be any non-alphanumeric, non-backslash, non-whitespace character.
Often used delimiters are forward slashes (/), hash signs (#) and tildes (~).
$regex_pattern = '/<td id="(\w+)" class="(\w+)">(\w+).com<\/td>/';
preg_match_all($regex_pattern, $result, $matches);
print_r($matches);
来源：https://stackoverflow.com/questions/11232375/preg-match-all-warning-preg-match-all-unknown-modifier-in