7. Flags on Regexes (Chapter 12)

Just some of the regex recommendations:

• Always use /x -- ie, use whitespace.

• Always use /m -- ie, ^ and $ mean start and end of line.

• Always use /s -- ie, . matches newlines.

• Multi line regexes should use m{}, not //.

• Use \A and \z to indicate beginning and end of string.

• Always match arbitrary whitespace if humans have been involved.