Regular Expressions 101

Pro

1st Alternative([\d.]+)\s?(\D{0,2})\s?x\s?([\d.]+)\s?\2?

Group 1([\d.]+)

Character Class[\d.]+

+matches at least one character from the set below:

\da digit

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\s?optionally matches any whitespace character

Group 2(\D{0,2})

\D{0,2}any character that's not a digit, repeated between 0 and 2 times

\s?optionally matches any whitespace character

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case insensitive)

\s?optionally matches any whitespace character

Group 3([\d.]+)

Character Class[\d.]+

+matches at least one character from the set below:

\da digit

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\s?optionally matches any whitespace character

\2?optionally matches the text saved by group 2

2nd Alternative(\d+)

Group 4(\d+)

\d+a digit, repeated at least once

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

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

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25 tokens

([\d.]+)\s?(\D{0,2})\s?x\s?([\d.]+)\s?\2?|(\d+)

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