Re: Regex to match 20 chars of some digits followed by some spaces

[leriksen]

Some collegues are first to the punch

mildside has

m/^\d((?<=\d)\d(?=([ \d]|$))|(?<=[\d ]) (?=( |$))){19}$/

another is

m/^(?=\d*(?:\d ) *(?!\d)$)[0-9 ]{20}$/