Regex to Remove HTML Tags

Question

input:

<td>
<span>
<span>spanaaa</span>
<span class="1">spanbbb</span>
<span class="" style="">spanccc</span>
<span style="display:none">spanddd</span>

<div>divaaa</div>
<div class="1">divbbb</div>
<div class="" style="">divccc</div>
<div style="display:none">divddd</div>
</span>
</td>

I need a regular express or a method in order to get the values without attribute style="display:none"

output:

spanaaa
spanbbb
spanccc

divaaa
divbbb
divccc

Answer 1

The pattern [.NET flavor]

(?<=<\w+ [^<>]*?\w+=")(?!display:none)(?<mt>[^"<>]+)(?=")

Options: ^ and $ match at line breaks

Assert that the regex below can be matched, with the match ending at this position (positive lookbehind) «(?<=<\w+ [^<>]*?\w+=")»
   Match the character “<” literally «<»
   Match a single character that is a “word character” (letters, digits, and underscores) «\w+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
   Match the character “ ” literally « »
   Match a single character NOT present in the list “<>” «[^<>]*?»
      Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?»
   Match a single character that is a “word character” (letters, digits, and underscores) «\w+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
   Match the characters “="” literally «="»
Assert that it is impossible to match the regex below starting at this position (negative lookahead) «(?!display:none)»
   Match the characters “display:none” literally «display:none»
Match the regular expression below and capture its match into backreference with name “mt” «(?<mt>[^"<>]+)»
   Match a single character NOT present in the list “"<>” «[^"<>]+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Assert that the regex below can be matched, starting at this position (positive lookahead) «(?=")»
   Match the character “"” literally «"»

The pattern [PCRE]

<!--
(<\w+ [^<>]*?\w+=")(?!display:none)([^"<>]+)(?=")

Options: ^ and $ match at line breaks

Match the regular expression below and capture its match into backreference number 1 «(<\w+ [^<>]*?\w+=")»
   Match the character “<” literally «<»
   Match a single character that is a “word character” (letters, digits, and underscores) «\w+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
   Match the character “ ” literally « »
   Match a single character NOT present in the list “<>” «[^<>]*?»
      Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?»
   Match a single character that is a “word character” (letters, digits, and underscores) «\w+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
   Match the characters “="” literally «="»
Assert that it is impossible to match the regex below starting at this position (negative lookahead) «(?!display:none)»
   Match the characters “display:none” literally «display:none»
Match the regular expression below and capture its match into backreference number 2 «([^"<>]+)»
   Match a single character NOT present in the list “"<>” «[^"<>]+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Assert that the regex below can be matched, starting at this position (positive lookahead) «(?=")»
   Match the character “"” literally «"»

Answer 2

正则表达式不是一个很好的选择（由于HTML的变化无常），但是您可以尝试以下方法：

<div(?!\s*style="display:none")[^>]*>(.*?)</div>

Answer 3

input = Regex.Replace(input, @"<div style=""display:none"">(.|\n)*?</div>", string.Empty, RegexOptions.Singleline);  

Here input is the string that contains Html. Try this regex, it will work!

Answer 4

It is CSharp version that 8x faster than regex parsing. You can easily convert to any language you would like.

public static string StripTagsCharArray(string source)
{
char[] array = new char[source.Length];
int arrayIndex = 0;
bool inside = false;

for (int i = 0; i < source.Length; i++)
{
    char let = source[i];
    if (let == '<')
    {
    inside = true;
    continue;
    }
    if (let == '>')
    {
    inside = false;
    continue;
    }
    if (!inside)
    {
    array[arrayIndex] = let;
    arrayIndex++;
    }
}
return new string(array, 0, arrayIndex);
}