Regular Expressions 101

Explanation

Pro

^start of string

Group 1(\s*\S+(?:\s+\S+){1,5}\s*)

\s*any whitespace character, repeated any number of times

\S+any non-whitespace character, repeated at least once

Non-Capturing Group(?:\s+\S+){1,5}

{1,5}repeats the group contents below between 1 and 5 times:

\s+any whitespace character, repeated at least once

\S+any non-whitespace character, repeated at least once

\s*any whitespace character, repeated any number of times

$end of string

Global pattern flags

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

g modifier: global. Finds all matches instead of stopping after the first

s modifier: single line. Allows a dot to match line terminators

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26 tokens

^(\s*\S+(?:\s+\S+){1,5}\s*)$

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