Regex instead of string.replace function

Question

I've seen this CheatSheet for Regex in C#

However, I'm trying to create a regex function which can replace this for me:

while (fname.Contains(".."))
{
    fname = fname.Replace("..", ".");
}
if (fname.StartsWith(".")) { 
    fname=  fname.Remove(0, 1);
}
fname = fname.Replace("&", "_");
fname = fname.Replace("#", "_");
fname = fname.Replace("{", "_");
fname = fname.Replace("}", "_");
fname = fname.Replace("%", "_");
fname = fname.Replace("~", "_");
fname = fname.Replace("?", "_");

I simply don't get how to write the regex which will fix this issue for me. Can anyone give me a hand?

@WillVousden It was added when I hit enter? I was updating it.There was no way for me to show I was updating it. — Rob
– Rob, Commented Dec 20, 2012 at 8:05
Do you mean while (fname.Contains("..")) fname = fname.Replace("..", "."); perhaps? — Kieren Johnstone
– Kieren Johnstone, Commented Dec 20, 2012 at 8:15
if you've trouble building your regular expression: try this for building it — Steffen Winkler
– Steffen Winkler, Commented Dec 20, 2012 at 8:17
@SteffenWinkler sometimes there will be small difference in .net regex and JS. I use sharpdev.ru/Regex/Sharp . It's in russian, but you can use google translate — Dmitrii Dovgopolyi
– Dmitrii Dovgopolyi, Commented Dec 20, 2012 at 8:24

Dmitrii Dovgopolyi · Accepted Answer · 2012-12-20 08:31:17Z

7

string dotsPattern = @"\.\.+"; //2 or more dots.
fname=Regex.Replace(fname, dotsPattern ,".");
String firstSymbolDot = @"^\.";
fname = Regex.Replace(fname, firstSymbolDot, String.Empty);
string symbolPattern = "[&#{}%~?]"; //any of given symbol;
string result = Regex.Replace(fname, symbolPattern, "_");

edited Dec 20, 2012 at 8:31

answered Dec 20, 2012 at 8:17

Dmitrii Dovgopolyi

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1 Comment

Rob Over a year ago

You're not using symbolPattern now, but I know it should be behind Replace(fname, symbolPattern,"_"); Thanks :)

Robert Allan Hennigan Leahy · Accepted Answer · 2012-12-20 08:16:58Z

0

Why are you looping over fname=fname.Replace("..", ".");, are you trying to replace all sequences of more than one dot with just one dot?

That's:

fname=Regex.Replace(fname,@"\.+",".");

As for the others:

fname=Regex.Replace(
    Regex.Replace(
        fname,
        @"&|\#|\{|\}|%|~|\?",
        "_"
    ),
    @"^\.",
    ""
);

answered Dec 20, 2012 at 8:16

Robert Allan Hennigan Leahy

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