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Floating point and scientific notation regex
0
Regular Expression
PCRE2 (PHP >=7.3)
/
^
(?:
[
+-
]
?
#
optional
sign
(?:
#
start
a
conditional
group
\d
+
#
either
a
nonzero
number
of
digits
|
#
or
a
decimal
phrase
\d
*
#
optional
digits
preceding
the
decimal
\.
(?=
\d
)
#
a
literal
decimal
followed
by
at
least
one
digit
\d
*