Regular Expressions 101

Negative Lookbehind(?<![.\d])

Character Class[.\d]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\da Unicode decimal digit

Character Class[-+]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

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

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

\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 any number of times

2nd Alternative\.\d+

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

Negative Lookahead(?![.\d])

Character Class[.\d]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\da Unicode decimal digit

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<![.\d])[-+]?(?:\d+(?:\.\d*)?|\.\d+)(?![.\d])

New

"Test string 1.234 0.155.1 5.67799350,-2.654657