this will match the frequently and rarely using musical chords in a sheet music

For this task, I did not need inet6 (IPv6 stuff), so I left it out. The regex in its current state does not allow for that to be included without manually adding the entire second part

8 digits or 10 digits

validates any date in (d)d-(M)M-yyyy format from 1581-01-01 to 9999-12-31, allowed delimiters are "/", "." and "-"

validates any date in yyyy-M-d format from 1581-01-01 to 9999-12-31, allowed delimiters are "/", "." and "-"

validates any date in M-d-yyyy format from 1581-01-01 to 9999-12-31, allowed delimiters are "/", "." and "-"

cleans up a semicolon delimited list (remove white spaces, multiple semicolons, semicolons at the beginning or the end)

Think about first letter and the later parts are some specific symbol ( .-).

Extract the options from a rule in the js_htparser framework {{ request: key option1:value1 option2:value2 }} When executing the regex the matches will be: group1 = option key ( 1. iteration: option1, 2. iteration: option2 ) group2 = option value ( 1. iteration: value1, 2. iteration: value2 )