regex101: Python Substitution Workspace

\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

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

?repeats the group contents below at most once:

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

*repeats the group contents below any number of times:

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

\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

Positive Lookahead(?=[ \t]+[cm]m)

Character Class[ \t]+

+matches at least one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

Character Class[cm]

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

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

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

Search reference

Regular Expression

\d+(?:\.\d+)?(?:(?:x\d+(?:\.\d+)?)*)?(?=[ \t]+[cm]m)

New

The study reveals a speculated nodule with pleural tagging at anterior basal segment of LLL, measured 1.9x1.4x2.0 cm in size
Other two ill defined, small ground glass lesions measured 4.0 mm and 3 mm in size, respectively.

The study reveals a speculated nodule with pleural tagging at anterior basal segment of LLL, measured 1.9x1.4x2.0 cm in size
Other two ill defined, small ground glass lesions measured 4.0    mm and 3      mm in size, respectively.

Regular Expressions 101

Regular Expression

Extraction