Unrecognized escape sequence

[Christopher Ireland]

Hi --

Any ideas on this one please ...

The following code works as expected:
private void Form1_Load(obje ct sender, System.EventArg s e) {
string text = "The quick brown"+ " FOX " +"jumps over the lazy dog.";
string pattern = "FOX";
string replacement = "cat";

string
result=Regex.Re place(text,patt ern,replacement ,System.Text.Re gularExpression s
..RegexOptions. IgnoreCase);
richTextBox1.Te xt = result;
}

However, this code doesn't:
private void Form1_Load(obje ct sender, System.EventArg s e) {
string text = "The quick brown"+ " C:\\TEST\\MyDir ectory " +"jumps over the
lazy dog.";
string pattern = "C:\\TEST\\MyDi rectory";
string replacement = "..\\..";

string
result=Regex.Re place(text,patt ern,replacement ,System.Text.Re gularExpression s
..RegexOptions. IgnoreCase);
richTextBox1.Te xt = result;
}

The above bombs out with an Unrecognized escape sequence. All I'm trying to
do is perform a case-insensitive replace function on text with directory
paths in it ..

Many thanks!

Chris.

[Niki Estner]

Re: Unrecognized escape sequence

The problem is that regular expressions use the backslash as escape
characters, too; Use Regex.Escape(pa ttern).
This will escape all regex-metacharacters in the pattern string.

Niki

"Christophe r Ireland" <dead@asadoorna il.com> wrote in
news:ORx6D$XnEH A.3460@tk2msftn gp13.phx.gbl...[color=blue]
> Hi --
>
> Any ideas on this one please ...
>
> The following code works as expected:
> private void Form1_Load(obje ct sender, System.EventArg s e) {
> string text = "The quick brown"+ " FOX " +"jumps over the lazy dog.";
> string pattern = "FOX";
> string replacement = "cat";
>
> string
> result=Regex.Re place(text,patt ern,replacement ,System.Text.Re gularExpression s
> .RegexOptions.I gnoreCase);
> richTextBox1.Te xt = result;
> }
>
> However, this code doesn't:
> private void Form1_Load(obje ct sender, System.EventArg s e) {
> string text = "The quick brown"+ " C:\\TEST\\MyDir ectory " +"jumps over
> the
> lazy dog.";
> string pattern = "C:\\TEST\\MyDi rectory";
> string replacement = "..\\..";
>
> string
> result=Regex.Re place(text,patt ern,replacement ,System.Text.Re gularExpression s
> .RegexOptions.I gnoreCase);
> richTextBox1.Te xt = result;
> }
>
> The above bombs out with an Unrecognized escape sequence. All I'm trying
> to
> do is perform a case-insensitive replace function on text with directory
> paths in it ..
>
> Many thanks!
>
> Chris.
>
>[/color]

[Christopher Ireland]

Re: Unrecognized escape sequence

"Niki Estner" <niki.estner@cu be.net> wrote in message
news:uVHEkPbnEH A.608@TK2MSFTNG P09.phx.gbl...[color=blue]
> The problem is that regular expressions use the backslash as escape
> characters, too; Use Regex.Escape(pa ttern).
> This will escape all regex-metacharacters in the pattern string.[/color]

Excellent! Thanks Niki!!

Chris.