C# String.Replace with a start/index (Added my (slow) implementation)
- by Chris T
I'd like an efficient method that would work something like this
EDIT: Sorry I didn't put what I'd tried before. I updated the example now.
// Method signature, Only replaces first instance or how many are specified in max
public int MyReplace(ref string source,string org, string replace, int start, int max)
{
int ret = 0;
int len = replace.Length;
int olen = org.Length;
for(int i = 0; i < max; i++)
{
// Find the next instance of the search string
int x = source.IndexOf(org, ret + olen);
if(x > ret)
ret = x;
else
break;
// Insert the replacement
source = source.Insert(x, replace);
// And remove the original
source = source.Remove(x + len, olen); // removes original string
}
return ret;
}
string source = "The cat can fly but only if he is the cat in the hat";
int i = MyReplace(ref source,"cat", "giraffe", 8, 1);
// Results in the string "The cat can fly but only if he is the giraffe in the hat"
// i contains the index of the first letter of "giraffe" in the new string
The only reason I'm asking is because my implementation I'd imagine getting slow with 1,000s of replaces.
