Regular Expressions 101

Negative Lookbehind(?<!\S)

\Sany character that is not Unicode whitespace

Group 1(\d+\.\d+x\d+\.\d+x\d+\.\d+)

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

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

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

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

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[cm]

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case sensitive)

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case sensitive)

Negative Lookahead(?!\S)

\Sany character that is not Unicode whitespace

Global pattern flags

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

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Search reference

Regular Expression

(?<!\S)(\d+\.\d+x\d+\.\d+x\d+\.\d+) [cm]m(?!\S)

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