https

The way I like it formatted

username is 4-32 characters long no _,- or . at the beginning no _ or _. or . or .. or .- or _- inside no _,- or . at the end ^(?=.{4,32}$)(?![.-])(?!.*[.]{2})[a-zA-Z0-9.-]+(?<![.])$...

Trying to understand the two digit lookup.

Extracts HTML tags, HTML entities, alphanumeric words, and the rest.

Matches phone #s (aaa) bbb-cccc aaa bbb cccc aaabbbcccc and such.

In Vehicle Identification Number used by motor vehicle manufacturers, the letters I, O and Q are omitted for their similarity to 1 or 0.

Checks for well formed tags. Must include mailto, http or https. Must have quoted href. Other attribues before or after href are accepted. Must be ended with

works but capturing groups are not so organized testing string: "https://127.0.0.1:8000/path/subpath/otherpath" "https://127.0.0.1/path/subpath/otherpath" "https://127.0.0.1/12345/subpath/otherpath"