I am looking to take a string from an input text box and remove all special characters and spaces.
e.g. Input: ##HH 4444 5656 3333 2AB## Output: HH4444565633332AB
CodePudding user response：
Let's define what we are going to keep, not what to remove. If we keep Latin letters and digits only we can put
string result = Regex.Replace(input, "[^A-Za-z0-9]", "");
or (Linq alternative)
string result = string.Concat(input
.Where(c => c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' c >= '0' && c <= '9'));
CodePudding user response：
If dealing with unicode to remove one or more characters that is not a letter nor a number:
[^\p{L}\p{N}]
See this demo at regexstorm or a C# replace demo at tio.run
\p{L}matches any kind of letter from any language\p{N}matches any kind of numeric character in any script