I am trying to write a regular expression by which i can replace rgb color value with hex code in a string. The string may have following types :
=> rgb(0, 0, 0) 0 0 0
=> rgb(0 100, 200)
=> 0 0 rgb(201,45,65)
First i want to access the rgb value from the string and then replace it back with hex code. So result will be :
=> #XXXXXX 0 0 0
=> #XXXXXX
=> 0 0 #XXXXXX
var newstr = Regex.Replace(
input,
@"rgb\([ ]*(\d+)[ ]*,[ ]*(\d+)[ ]*,[ ]*(\d+)[ ]*\)",
m => {
return "#" + Int32.Parse(m.Groups[1].Value).ToString("X2") +
Int32.Parse(m.Groups[2].Value).ToString("X2") +
Int32.Parse(m.Groups[3].Value).ToString("X2");
}
);
To get the values from your string, you could do a substring based on index of "rbg(" and ")" and then do subsequent splits on " " and/or ",". Then...
See here:
http://bytes.com/topic/c-sharp/answers/268611-convert-rgb-hexadecimal
public static string ToHtml ( System.Drawing.Color color )
{
if (System.Drawing.Color.Transparent == color)
return "Transparent";
return string.Concat("#", (color.ToArgb() & 0x00FFFFFF).ToString("X6"));
}
Or:
System.Drawing.Color color = System.Drawing.Color.FromArgb(longRgb);
How about
string str = "rgb(0 100, 200)";
int startindex = str.IndexOf("rgb(");
int endindex = str.LastIndexOf(')');
string result = str.Substring(0, startindex)
+ "#XXXXXX"
+ str.Substring(endindex + 1);
Tried for all 3 options you have given.
