Another reason to use a noncapturing group here is to allow you to keep using the same replacement string as in the previous examples.
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None Regex flavors: Both are followed by a question mark, which makes them optional. The parentheses that appear without backslashes are capturing groups and are used to remember the values matched within them so that the matched text can be recalled later. Character classes allow you to match any one out of a set of characters.
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A question mark mentioned earlier is a quantifier that causes its preceding element to match zero or one time. This is a textbook example of where we need a backslash to escape a special character so the regular expression treats it as literal input. Another way to ensure that a hyphen inside a character class matches a literal version of itself is to escape it with a backslash.
The second group of three digits, known as the central office or exchange code, starts with a number 2—9, followed by any two digits.
Another reason to use a noncapturing group here is to allow you to keep using the same replacement string as in the previous examples. Another way to ensure that a hyphen inside a character class matches a literal version of itself is to escape it with a backslash. Since a question mark is used after each separator, the phone number digits are allowed to run together.
Variations Eliminate invalid phone numbers So far, the regular expression matches any digit number.