CODEWITHSUNDEEP
c#regex
Parameswari
Parameswari

Reputation: 69

To split numeric part from alpha numeric

I have a AlphaNumeric value which may contain white space or under score in it. I want to split numeric from that and increment the value by one and need to join the numeric part back to Alpha part.

For example the Alpha Numeric may be : 1- BA 123 or 2. BA_123

I used Regex , it works if the string does not contain any white spaces or under score . Here is the code used to split and increment by one:

string StrInputNumber="BA123" 
var numAlpha = new Regex("(?<Alpha>[a-zA-Z]*)(?<Numeric>[0-9]*)"); 
var match = numAlpha.Match(StrInputNumber); 
var alpha = match.Groups["Alpha"].Value; 
int num = int.Parse(match.Groups["Numeric"].Value);

This works only for Alpha and numeric without any special characters

Please guide to solve this issue

Upvotes: 2

Views: 1896

Answers (2)

stema
stema

Reputation: 92986

You just need to add those characters at the point where you expect them.

string[] StrInputNumber = { "BA123", "BA_123", "BA 123", "Foo 1"};
foreach (String item in StrInputNumber) {

    Console.Write(item + "\t==>\t");
    var numAlpha = new Regex("(?<Alpha>[a-zA-Z]*[ _]?)(?<Numeric>[0-9]*)");
    var match = numAlpha.Match(item);
    var alpha = match.Groups["Alpha"].Value;
    int num = int.Parse(match.Groups["Numeric"].Value) + 1;

    Console.WriteLine(alpha + num);
}

This would allow (optionally) one space or one _ after the letters.

If you want to be more flexible, you can just add the characters in the class where the letters are.

var numAlpha = new Regex("(?<Alpha>[a-zA-Z _]*)(?<Numeric>[0-9]*)");

That would allow any amount of spaces and underscores anywhere before the digits in the string (e.g. "Foo _ bar ___ 123" would match).

Unicode

If you want to match all letters and not only the ASCII ones, try Unicode code properties

\p{L} would be any letter in any language

\d is a shorthand character class for digits

var numAlpha = new Regex("(?<Alpha>[\p{L} _]*)(?<Numeric>\d*)");

Further reading

For some regex basics you can see

Upvotes: 3

t3hn00b
t3hn00b

Reputation: 912

Not sure if that's what you ask but - if you have 1 whitespace or underscore:

var numAlpha = new Regex("(?<Alpha>[a-zA-Z]*)[ _]{1}(?<Numeric>[0-9]*)");

If you have many:

var numAlpha = new Regex("(?<Alpha>[a-zA-Z]*)[ _]*(?<Numeric>[0-9]*)");

Upvotes: 0

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