Search & Replace insensitive

i have been asked, why c# implements in the string class a replace method that is so lame, why cant we replace a substring in a string no matter what the case is?

lame? i say, well, thats the fun, lets see how that will be implemented:

private int NoCaseReplace(ref string src, string find, string replace)

{

int x=0; /*counter*/

int occur=0; /*how many occurances*/

bool found = false; /*was the string found (in a single round)*/

int isrcl = src.Length;

int ifndl = find.Length;

find = find.ToLower();

/*converting to char array gives us the way to examine char by char*/

char[] str = src.ToCharArray();

char[] fnd = find.ToCharArray();

for (x=0;x<isrcl-1;x++)

{

if ((fnd[0]==str[x])||((fnd[0]-('a'-'A'))==str[x]))

{

int j=x;/*to prevent the global counter from being advanced*/

found = true;/*intialize to true*/

for (int y=0;y<ifndl;y++,j++)/*run in the find string and compare*/

{

if((fnd[y]!=str[j])&&((fnd[y]-('a'-'A'))!=str[j]))found = false;

}

}

if (found)

{

src = src.Remove (x,ifndl); /*remove the string we found*/

src = src.Insert (x,replace);/*insert the replace string*/

x+=ifndl-1; /*set the char array to point after the addition*/

found = false; /*reset to false*/

occur++;/*increase the number of occurance*/

}

}

return occur;

}

hope that all you who asked about this and my article about the ToCharArray usage, got a little more comfortable now.

© Copyright 2002 Sagiv Hadaya. Last update: 10/11/2002; 2:00:04 AM.