Irregular

0.6.8

RegEx/Markdown/ThematicBreak.regex.txt

                                # Matches markdown horizontal rules

(?m)                    # Set multiline mode

^                       # Match the line start

\s{0,3}                 # Match up to three whitespace characters

(?<BreakChar>

    [-_\*]              # Then either a dash, underscore, or asterisk 

)

(?:

\k<BreakChar>\s{0,}

){2,}                   # Followed by at least 2 of the same character

\s{0,}                  # any any trailing whitepsace

$                       # until the end of the line.