regex101: float

Group 1((?:\d*\.\d+)|(?:\d|[1-9]\d+))

1st Alternative(?:\d*\.\d+)

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

\d*a digit, repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

2nd Alternative(?:\d|[1-9]\d+)

Non-Capturing Group(?:\d|[1-9]\d+)

1st Alternative\d

\da digit

2nd Alternative[1-9]\d+

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\d+a digit, repeated at least once

Non-Capturing Group(?:[fF])

Character Class[fF]

fthe literal f (102₁₀ / 146₈ / 66₁₆) (case sensitive)

Fthe literal F (70₁₀ / 106₈ / 46₁₆) (case sensitive)

Global pattern flags

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

Search reference

Regular Expression

((?:\d*\.\d+)|(?:\d|[1-9]\d+))(?:[fF])

New

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Edit the Expression & Text to see matches. Roll over matches or the expression for details. Undo mistakes with ctrl-z. Save & Share expressions with friends or the Community. A 1f full Reference & Help is available in 123l the Library, or watch the video Tutorial.
123.2L   3f .4f .454545F 
Sample text for testing:
abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
0123456789 +-.,!@#$%^&*();\/|<>"'
12345 -98.7 3.141 .6180 9,000 +42
555.123.4567	+1-(800)-555-2468
foo@demo.net	bar.ba@test.co.uk
www.demo.com	http://foo.co.uk/
http://regexr.com/foo.html?q=bar

Regular Expressions 101

Regular Expression

Extraction