【Unity】AssetDatabase.FindAssets使用内置表达式
google上找了一圈，没有找到这样的问题，看到的回答对我都没有啥帮助，就自己写了一个！这是个小问题，就不废话了！
先看看AssetDatabase.FindAssets的api
public static string[] FindAssets(string filter, string[] searchInFolders)
{
SearchFilter searchFilter = new SearchFilter()
{
searchArea = SearchFilter.SearchArea.AllAssets
};
SearchUtility.ParseSearchString(filter, searchFilter);
if (searchInFolders != null && (uint) searchInFolders.Length > 0U)
{
searchFilter.folders = searchInFolders;
searchFilter.searchArea = SearchFilter.SearchArea.SelectedFolders;
}
return AssetDatabase.FindAssets(searchFilter);
}
这里能看到FindAssets实际上是通过SearchUtility.ParseSearchString去生成filter的。
internal static bool ParseSearchString(string searchText, SearchFilter filter)
{
if (string.IsNullOrEmpty(searchText))
return false;
filter.ClearSearch();
filter.originalText = searchText;
string searchString1 = string.Copy(searchText);
// 这里是将": "替换成":"
SearchUtility.RemoveUnwantedWhitespaces(ref searchString1);
bool flag = false;
int startIndex1 = SearchUtility.FindFirstPositionNotOf(searchString1, " \t,*?");
if (startIndex1 == -1)
startIndex1 = 0;
int num1;
for (; startIndex1 < searchString1.Length; startIndex1 = num1 + 1)
{
num1 = searchString1.IndexOfAny(&#34; \t,*?&#34;.ToCharArray(), startIndex1);
if (num1 == -1)
num1 = searchString1.Length;
int num2 = searchString1.IndexOf(&#39;&#34;&#39;, startIndex1);
int startIndex2 = -1;
if (num2 != -1 && num2 < num1)
{
startIndex2 = searchString1.IndexOf(&#39;&#34;&#39;, num2 + 1);
if (startIndex2 != -1 && startIndex2 > num1 - 1)
{
num1 = searchString1.IndexOfAny(&#34; \t,*?&#34;.ToCharArray(), startIndex2);
if (num1 == -1)
num1 = searchString1.Length;
}
}
if (num1 > startIndex1)
{
string searchString2 = searchString1.Substring(startIndex1, num1 - startIndex1);
if (SearchUtility.CheckForKeyWords(searchString2, filter, num2 - startIndex1, startIndex2 - startIndex1))
{
flag = true;
}
else
{
SearchFilter searchFilter = filter;
searchFilter.nameFilter = searchFilter.nameFilter + (string.IsNullOrEmpty(filter.nameFilter) ? &#34;&#34; : &#34; &#34;) + searchString2;
}
}
}
return flag;
}
大致代码如上，官方文档说明是这样的 https://docs.unity3d.com/2021.1/Documentation/Manual/search-filters.html
所以如果想要在AssetDatabase.FindAssets中使用正则，就需要按照官方文档这样子说明使用才可以。
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