Comments in regular expression (?#...)
Q
Is there any way to enter a comment into regular expressions?
How to write a regular expression with comments to match date strings in yyyy-mm-dd format like: 2013-01-26
✍: FYIcenter.com
A
Yes. Comments can be entered in regular expressions using (?#...) format. For example:
"(?:[^"\]++(?#no-backtracking)|\.)*+(?#no-backtracking)"
The regular expression with comments to validate data strings:
(?#year)\d{4}-(?#month)\d{2}-(?#day)\d{2}
(?#year) - comment
\d{4} - 4 digits for year
(?#month) - comment
\d{2} - 2 digits for month
(?#day) - comment
\d{2} - 2 digits for day
2013-01-26, 2551👍, 0💬