正则表达式用于替换两个字符串 c# 之间的文本

>我有以下字符串：

 <span><style>
.G9cT{display:none}
.Q-Bv{display:inline}
</style><span class="G9cT">74</span><span style="display:none">100</span><span class="G9cT">100</span><div style="display:none">100</div><span style="display:none">122</span><span class="G9cT">122</span><div style="display:none">122</div><span style="display:none">178</span><span class="G9cT">178</span><span class="165">189</span><span class="G9cT">202</span><div style="display:none">202</div><span style="display:none">214</span><span class="G9cT">214</span><div style="display:none">214</div><span style="display:none">230</span><div style="display:none">230</div><span class="Q-Bv">.</span><span style="display:none">53</span><span class="G9cT">53</span><span class="G9cT">68</span><div style="display:none">68</div><span style="display:none">81</span><span class="G9cT">81</span><div style="display:none">81</div><span style="display: inline">112</span><span style="display:none">124</span><span class="G9cT">124</span><div style="display:none">127</div><span style="display:none">129</span><span class="G9cT">129</span><span></span><span class="G9cT">151</span><div style="display:none">155</div><span style="display:none">194</span><div style="display:none">194</div><span style="display:none">233</span><span class="G9cT">233</span><span></span><span class="G9cT">234</span><span class="Q-Bv">.</span><span></span><div style="display:none">61</div>88<div style="display:none">98</div><span style="display:none">105</span><span class="G9cT">105</span><div style="display:none">105</div><div style="display:none">117</div><span style="display:none">197</span><span class="G9cT">197</span><div style="display:none">197</div><span style="display: inline">.</span><span class="Q-Bv">65</span><span style="display:none">147</span><div style="display:none">147</div></span>

我正在使用Regex将上面的字符串替换为两个标签之间的空 <span style="display:none"> * </span>.我正在使用下面的代码：

System.Text.RegularExpressions.Regex regex = new System.Text.RegularExpressions.Regex("<span style='"display:none'">(.*)</span>");
var v = regex.Match(txxt);
string output = System.Text.RegularExpressions.Regex.Replace(txxt, "<span style='"display:none'">(.*)</span>", "");

但是上面替换了从头到<span style='"display:none'">到结束的字符串。我尝试了不同的组合。任何建议。