Regular Expressions 101

Pro

\s+a Unicode whitespace character, repeated at least once

Positive Lookahead(?=\d+(?:\.\d+)?%\s*$)

\d+a Unicode decimal digit, repeated at least once

Non-Capturing Group(?:\.\d+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a Unicode decimal digit, repeated at least once

%the literal % (37₁₀ / 45₈ / 25₁₆)

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

$end of line

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

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25 tokens

\s+(?=\d+(?:\.\d+)?%\s*$)

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