Help on string

[SnakeS]

Hi,

I want modify a string as "1122334455 66" in
"11:22:33:44:55 :66"

which is the best method?

Using a RegExp? and if yes how?

Thanks in advance

[Ralf B.]

ok point taken... in this case

StringBuilder sb = new StringBuilder(" 112233445566", 20);
for (int i = 2; i < 15; i += 3)
sb.Insert(i, ":");

"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** *************** @msnews.microso ft.com...

Ralf B. <ra*********@mo rtgageuk.com> wrote:

i am creating 5 substrings..

your solution works but has a lot of code..

substring() produces temp strings, too. Also, I suppose StringBuilder
internally works with temporary strings as well.

StringBuilder uses a temporary string if it needs to be expanded, but
if you give it the right size to start with, it shouldn't need any
temporary measures.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Jon Skeet [C# MVP]]

Ralf B. <ra*********@mo rtgageuk.com> wrote:

ok point taken... in this case

StringBuilder sb = new StringBuilder(" 112233445566", 20);
for (int i = 2; i < 15; i += 3)
sb.Insert(i, ":");

That would certainly be significantly better, yes. Quite possibly
better than all the other suggestions, although it does involve copying
the data around a bit. (Every time you insert something, you need to
copy the rest of the string.)

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

What about:

StringBuilder sb = new StringBuilder( 20)
int start = 0;
string str = "1122334455 66";
while ( str.Length - start > 2 )
{
if ( start != 0 )
sb.Append( ':' ); // Adding a CHAR
sb.Append( str[ start++] );
sb.Append( str[ start++] );
}

No temp string created :D

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation
"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** *************** *@msnews.micros oft.com...

Ralf B. <ra*********@mo rtgageuk.com> wrote:

ok point taken... in this case

StringBuilder sb = new StringBuilder(" 112233445566", 20);
for (int i = 2; i < 15; i += 3)
sb.Insert(i, ":");

That would certainly be significantly better, yes. Quite possibly
better than all the other suggestions, although it does involve copying
the data around a bit. (Every time you insert something, you need to
copy the rest of the string.)

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Jon Skeet [C# MVP]]

<"Ignacio Machin \( .NET/ C# MVP \)" <ignacio.mach in AT
dot.state.fl.us >> wrote:

What about:

StringBuilder sb = new StringBuilder( 20)
int start = 0;
string str = "1122334455 66";
while ( str.Length - start > 2 )
{
if ( start != 0 )
sb.Append( ':' ); // Adding a CHAR
sb.Append( str[ start++] );
sb.Append( str[ start++] );
}

No temp string created :D

Indeed. I don't know whether the double append is faster than

sb.Append(str, start, 2);

or not.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

:)

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** *************** *@msnews.micros oft.com...

<"Ignacio Machin \( .NET/ C# MVP \)" <ignacio.mach in AT
dot.state.fl.us >> wrote:

What about:

StringBuilder sb = new StringBuilder( 20)
int start = 0;
string str = "1122334455 66";
while ( str.Length - start > 2 )
{
if ( start != 0 )
sb.Append( ':' ); // Adding a CHAR
sb.Append( str[ start++] );
sb.Append( str[ start++] );
}

No temp string created :D

Indeed. I don't know whether the double append is faster than

sb.Append(str, start, 2);

or not.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too