将HTML转换为有效的XML标签
我需要帮助编写一个将HTML字符串转换为有效的XML标记名称的正则表达式函数。 例如：它需要一个字符串并执行以下操作：
Ex:
Input: Date Created
Ouput: Date_Created
Input: Date<br/>Created
Output: Date_Created
Input: DatenCreated
Output: Date_Created
Input: Date 1 2 3 Created
Output: Date_Created
基本上，正则表达式函数应该将HTML字符串转换为有效的XML标签。
一些正则表达式和一些标准函数：
function mystrip($s)
{
// add spaces around angle brackets to separate tag-like parts
// e.g. "<br />" becomes " <br /> "
// then let strip_tags take care of removing html tags
$s = strip_tags(str_replace(array('<', '>'), array(' <', '> '), $s));
// any sequence of characters that are not alphabet or underscore
// gets replaced by a single underscore
return preg_replace('/[^a-z_]+/i', '_', $s);
}
尝试这个
$result = preg_replace('/([ds]|<[^<>]+>)/', '_', $subject);
说明
"
( # Match the regular expression below and capture its match into backreference number 1
# Match either the regular expression below (attempting the next alternative only if this one fails)
[ds] # Match a single character present in the list below
# A single digit 0..9
# A whitespace character (spaces, tabs, and line breaks)
| # Or match regular expression number 2 below (the entire group fails if this one fails to match)
< # Match the character “<” literally
[^<>] # Match a single character NOT present in the list “<>”
+ # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
> # Match the character “>” literally
)
"
应该可以使用：
$text = preg_replace( '/(?<=[a-zA-Z])[^a-zA-Z_]+(?=[a-zA-Z])/', '_', $text );
因此，可以看到前后是否有字母字符，并替换了它之间的任何非alpha /非下划线。
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