public static string Replace(java.lang.String str, string oldStr, string newStr)
{
ThrowHelper.ThrowIfNull(oldStr);
int lenOld = ((java.lang.String)(object) oldStr).length();
if (lenOld == 0)
{
throw new System.ArgumentException();
}
int idx1 = str.indexOf(oldStr, 0);
if (idx1 == -1)
{
return((string)(object)str);
}
int idx0 = 0;
int len = str.length();
var sb = new java.lang.StringBuilder();
for (;;)
{
sb.append(str.substring(idx0, idx1));
if (newStr != null)
{
sb.append(newStr);
}
if ((idx0 = idx1 + lenOld) >= len ||
(idx1 = str.indexOf(oldStr, idx0)) == -1)
{
sb.append(str.substring(idx0));
return(sb.ToString());
}
}
}
public static bool Contains(java.lang.String large, string small) => large.indexOf(small, 0) >= 0;
public static int IndexOf(java.lang.String str, char ch, int idx)
{
ThrowIfBadIndex(str, idx);
return(str.indexOf(ch, idx));
}
//
// IndexOf (char, ordinal)
//
public static int IndexOf(java.lang.String str, char ch) => str.indexOf(ch, 0);
