I want user only input 0-9 and only once "."
patt = /[^0-9(.{1})]/
1.2222 -> true
1.2.2 -> false (only once '.')
help me , thank !
PHP regex - valid float number
Viewed 30334
8 Answers
I wrote the following regex that seems to work best for my test inputs so far,
/^-?(\d|[1-9]+\d*|\.\d+|0\.\d+|[1-9]+\d*\.\d+)$/
It matches integer using the first two alternatives
\d|[1-9]+\d*
Then it look for numbers like .5, .55, .05 etc., that is beginning with a .
\.\d+
Then it looks for the same as previous but a 0 before the .
0\.\d+
Then finally it looks for patterns integer and decimal parts, such as 5.5, 5.05 etc.
[1-9]+\d*\.\d+
You can test the regex in this link
Related