How do you remove all the alphabetic characters from a string?

user_134202 0
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I have a string containg alphabetic characters, for example:

  1. 254.69 meters
  2. 26.56 cm
  3. 23.36 inches
  4. 100.85 ft

I want to remove all the alphabetic characters (units) from the above mentioned strings so that I can call the double.Parse() method.

.net c#
6 Answers

Hi another solution is:

// add directive at the top 
using System.Text.RegularExpressions;
string s = "24,99";
string numberOnly = Regex.Replace(s, "[^0-9,-]+", "")

This solution will not remove the dot e.g. question from user1804084:

this remove the dot for me e.g. 24.99 somechracter -> 2499

However it can still be convertet to a double where adding and subtraction works as normal.

user_127329230

The Regex, and Vlad's LINQ answers cover the solution well. And are both good options.

I had a similar problem, but I also wanted to only explicitly strip letters, and not to strip white space or etc, with this variant.

I also wanted it usable as below. Any of the other solutions could be packaged in a similar manner.

public static string StripAlpha(this string self)
{
    return new string( self.Where(c => !Char.IsLetter(c)).ToArray() );
}

public static string StripNonNumeric(this string self)
{
    // Use Vlad's LINQ or the Regex Example
    return new string(self.Where(c=>(Char.IsDigit(c)||c=='.'||c==',')).ToArray()) ;  // See Vlad's

}

This would then be used such as:

var newString = someString.StripAlpha();
var newString2 = someString.StripNonNumeric();
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