When you are writing regular expressions, there are instances where you need to validate if one or more characters exist in the string being evaluated. Regular expression quantifiers evaluate a string to determine if it has a certain number of characters. In the instance of the string ABC
, you can write a quantifier expression to evaluate that the string has at least one A
, one B
, one C
, and no D
. If the expression has the designated number of characters, it will evaluate as True
. If the expression contains less or more than the designated amount, it will return as False
.
The regular expression quantifiers include the following characters:
*
: This character requires zero or more matches of the preceding character to beTrue
. This means that if you specifyabc*d
, it will matcha
,b
and then zero or more ofc
followed by the letterd
. In the instance ofaaabbbbccccd
, the string will evaluate to beTrue
because the lettersa
,b
, andc
are in the exact order before...