Trying to understand what the below regex means.
/^[0-9]{2,3}[- ]{0,1}[0-9]{3}[- ]{0,1}[0-9]{3}$/
Sorry not exactly a coding question.
Let's break this regex into a few different parts:
^
: asserts position at start of the string[0-9]{2,3}
: Match a number between 0 and 9, between 2 and 3 times[- ]{0,1}
Matches a dash between zero and one times (Optional dash)[0-9]{3}
: Match a number between 0 and 9, exactly 3 times[- ]{0,1}
Matches a dash between zero and one times (Optional dash)[0-9]{3}
: Match a number between 0 and 9, exactly 3 times$
: asserts position at the end of the string, or before the line terminator right at the end of the string (if any)Here are a few strings that would pass this regex:
123-123-123
123123123
12-123-123
12123123
Here's a good resource to learn/test regexes: regex101.com
It matches two or three digits followed by (optionally) a dash or space, then 3 digits, again optional dash or space and 3 digits. It seems to try to match a telephone number written in different formats.