Mareo Code

Let’s say, you would like to count the number of characters group, for example: all upper case chars in string. How to do it? That’s easy by regular expressions.

Pattern for all upper case chars will be just: [A-Z] So here is a code:

string text = "Hmm, how to count ALL UpperCase chars?";
int result = Regex.Matches(text, "[A-Z]").Count;
// result = 6

We can use of course multiple rules at once. For example, to count all occurences of UpperCase chars, digits and 2 special symbols “#?”

string text = "#Hmm#, how to count ALL UpperCase chars?";
// pattern [A-Z] for UpperCase, [0-9] for numeric, [#?] for our special symbols
string pattern = @"[A-Z0-9#?]";
int result = Regex.Matches(text, pattern).Count;
// result = 9

and another trivial example.. Count all comma in a string.

string text = "1, 2, or maybe 3?";
string pattern = @"[,]";
int result = Regex.Matches(text, pattern).Count;
// result = 2