remove all non-letter characters from string

[Nicki Carstensen]

hi
I have a string from which I would like to purge all whitespaces,
non-english letters and special characters. I know I can use
String.TrimStar t(char[]) and then provide a list of all unwanted
characters, but the list will have to be large and cumbersome to
maintain. Is there a way to specify only_keep("A-z" && "0-9") or
something similar?

Thanks in advance

Nicki Carstensen
remove the car

[Jon Skeet [C# MVP]]

Nicki Carstensen <ni***@FORDbigf oot.com> wrote:

I have a string from which I would like to purge all whitespaces,
non-english letters and special characters. I know I can use
String.TrimStar t(char[]) and then provide a list of all unwanted
characters, but the list will have to be large and cumbersome to
maintain. Is there a way to specify only_keep("A-z" && "0-9") or
something similar?

Regex.Replace will probably do what you want, or you could fairly
easily hand-code a routine to do what you want. Bear in mind, however,
that "letters" contains much more than A-Z for the international
community - make sure you know exactly what you want to achieve before
you start.

--
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,

It could be as simple as this: ( not tested )

StringBuilder sb = new StringBuilder ();
for( int i=0; i< string.Length; i++ )
if ( (string[i]>='0' and string[i]<='9' ) || (string[i]>='A' and
string[i]<='z' ) )
sb.Append( string[i] );
Cheers,

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

"Nicki Carstensen" <ni***@FORDbigf oot.com> wrote in message
news:uH******** ******@TK2MSFTN GP10.phx.gbl...

hi
I have a string from which I would like to purge all whitespaces,
non-english letters and special characters. I know I can use
String.TrimStar t(char[]) and then provide a list of all unwanted
characters, but the list will have to be large and cumbersome to
maintain. Is there a way to specify only_keep("A-z" && "0-9") or
something similar?

Thanks in advance

Nicki Carstensen
remove the car

[Sami Vaaraniemi]

"Ignacio Machin ( .NET/ C# MVP )" <ignacio.mach in AT dot.state.fl.us > wrote
in message news:Og******** *****@TK2MSFTNG P11.phx.gbl...

Hi,

It could be as simple as this: ( not tested )

StringBuilder sb = new StringBuilder ();
for( int i=0; i< string.Length; i++ )
if ( (string[i]>='0' and string[i]<='9' ) || (string[i]>='A' and
string[i]<='z' ) )
sb.Append( string[i] );

The above won't work because there may be special characters (such as [
and ]) in between A and z. Moreover, if you want the code to work for
non-English languages too, better use:

StringBuilder sb = new StringBuilder ();
for (int i=0; i< string.Length; i++)
if (char.IsLetterO rDigit(string[i])
sb.Append(strin g[i]);

Regards,
Sami