Question

我目前正在遇到正则表达式的问题，虽然它有它需要的一切，是否有正则表达式长度限制？任何帮助将不胜感激

$possible_tags_in_regex = "/(<b>|<\/b>|<i>|<\/i>|<u>|<\/u>|<tt>|<\/tt>|<font size=[1-7]>|<font color=#[a-fA-F0-9]>|<\/font>)*/";
            // Add possible tags between every character in a string
            $regex = implode($possible_tags_in_regex, str_split($regex));
            $regex = $possible_tags_in_regex.$regex.$possible_tags_in_regex;

            // Format every regex every match with given tags
            if (preg_match_all($regex, $input, $to_be_replaced)) {

Answer 1

您的完整模式需要分隔符，但您在开头添加它们然后进行内爆和连接，因此您最终会遇到许多分隔符。从$possible_tags_in_regex中删除分隔符并在结尾处添加分隔符：

$possible_tags_in_regex = "(<b>|<\/b>|<i>|<\/i>|<u>|<\/u>|<tt>|<\/tt>|<font size=[1-7]>|<font color=#[a-fA-F0-9]>|<\/font>)*";
// Add possible tags between every character in a string
$regex = implode($possible_tags_in_regex, str_split($regex));
$regex = "/$possible_tags_in_regex.$regex.$possible_tags_in_regex/";

但是你可以通过使用不会出现在~等模式中的东西来消除所有的逃避：

$possible_tags_in_regex = "(<b>|</b>|<i>|</i>|<u>|</u>|<tt>|</tt>|<font size=[1-7]>|<font color=#[a-fA-F0-9]>|</font>)*";
// Add possible tags between every character in a string
$regex = implode($possible_tags_in_regex, str_split($regex));
$regex = "~$possible_tags_in_regex.$regex.$possible_tags_in_regex~";

preg_match_all（）：未知的修饰符＆＃39; /＆＃39;在

1 个答案: