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For the purposes of this regex, the authority/domain of a URL comes after the scheme + "//", and includes an optional username, password, and port. This is a perl-compatible regex (PCRE) that captures the various parts of the a domain, including the (optional) username, (optional) password, host, and (optional) port. The capturing groups are as follows: 1 = username, 2 = password, 3 = host, 4 = post. See the source link for the logic behind parsing the domain. NOTE: This is NOT intended to parse entire URLs, you will need a separate regular expression to extract the domain. Technically, only strings with newline characters are non-matches. The rest yield empty capturing groups. ANOTHER NOTE: This does NOT verify that only ascii characters are used in domain names. It is intended to extract pieces from domains that should already be valid.

Matches strings in source code for languages that allow string to be single- or double-quoted.

I had a CSV file with following format: book,chapter,verse_start,verse_end,notes I wanted to transform the rows to traditional english verse representations (i.e. "1 Timothy 2:2-4") Unfortunately, this regex always puts a '-' after the verse_start, so if verse_end is empty, the translated version will have a trailing '-'. Vim needs everything escaped, so here is the actual vim command for the substitution: :%s/\(\d\?\s\?\w\+\),\(\d\+\),\(\d\+\),\(\d*\),/\1 \2:\3-\4/g