Quantifiers It is curly brackets {}. It allows us to specify how many characters we want to match. It takes either one or two parameters, if we use one parameter, it means match exactly that number.

// By replacing the 1st digit of the 2-digit number *3, it turns out that six of the nine possible values: 13, 23, 43, 53, 73, and 83, are all prime. // By replacing the 3rd and 4th digits of 56**3 ...

Regular expressions are a way to describe patterns of text that can be useful for processing text documents or wherever one might want to look for a pattern and possibly replace another. Imagine you ...