public static string LeftFromFirst(this StringExtensions.SubstrExtensionPoint sp, string substring, StringComparison comparison = StringComparison.Ordinal)
{
string extendedValue = sp.ExtendedValue;
return(extendedValue.Safe <string, string>((string s) => {
substring = substring.EmptyIfNull();
int num = (s.IndexOf(substring, comparison) >= 0 ? s.IndexOf(substring, comparison) : -1);
if (num < 0)
{
return null;
}
return sp.Left(num);
}, null));
}
public static string LeftFromLast(this StringExtensions.SubstrExtensionPoint sp, string substring, StringComparison comparison = StringComparison.Ordinal)
{
string extendedValue = sp.ExtendedValue;
return(extendedValue.Safe <string, string>((string s) => {
substring = substring.EmptyIfNull();
int num = -1;
if (substring.IsEmpty())
{
num = 0;
}
else if (s.LastIndexOf(substring, comparison) >= 0)
{
num = s.LastIndexOf(substring, comparison);
}
if (num < 0)
{
return null;
}
return sp.Left(num);
}, null));
}
