Regular Expressions 101

\ban ASCII word boundary

\d+a digit, repeated at least once

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

\d+a digit, repeated at least once

Negative Lookahead(?!(?:\+\d+\+)?\d)

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

?repeats the group contents below at most once:

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

\d+a digit, repeated at least once

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

\da digit

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

\b\d+x\d+(?!(?:\+\d+\+)?\d)

New

Mon0 connected 1920x1200+0+0 0mm x 0 mm
   1920x1200_c 59.95*
Mon0 connected 1920x1200+0+0 0mm x 0 mm
   1920x1200_c 59.95*
Mon0 connected primary 1920x1200+0+1200 0mm x 0 mm
   1920x1200_c 59.95*
Mon0 connected 1029x1200+1920+1200 0mm x 0 mm
   1920x1200_c 59.95*