Regular Expressions 101

Pro

Group 1(\d+)

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

Positive Lookahead(?=м\b|\s+метров)

1st Alternativeм\b

мthe literal м (1084₁₀ / 2074₈ / 43C₁₆) (case insensitive)

\ba Unicode word boundary

2nd Alternative\s+метров

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

метровthe literal text метров (case insensitive)

Global pattern flags

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

u modifier: unicode. Treats the pattern and subject as UTF-16

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

Detailed match information will be displayed here automatically.

25 tokens

(\d+)(?=м\b|\s+метров)

New

Типа 10 метров.
А тут всего 9м.
Но не 8 м и не 7метров

Типа 10 метров.
А тут всего 9м.
Но не 8 м и не 7метров