regular expression for finding decimal/float numbers?

i need a regular expression for decimal/float numbers like 12 12.2 1236.32 123.333 and +12.00 or -12.00 or ...123.123... for using in javascript and jQuery. Thank you.

Optionally match a + or - at the beginning, followed by one or more decimal digits, optional followed by a decimal point and one or more decimal digits util the end of the string:

/^[+-]?\d+(\.\d+)?$/

RegexPal

The right expression should be as followed:

[+-]?([0-9]*[.])?[0-9]+

this apply for:

+1
+1.
+.1
+0.1
1
1.
.1
0.1

Here is Python example:

import re
#print if found
print(bool(re.search(r'[+-]?([0-9]*[.])?[0-9]+', '1.0')))
#print result
print(re.search(r'[+-]?([0-9]*[.])?[0-9]+', '1.0').group(0))

Output:

True
1.0

If you are using mac, you can test on command line:

python -c "import re; print(bool(re.search(r'[+-]?([0-9]*[.])?[0-9]+', '1.0')))"

python -c "import re; print(re.search(r'[+-]?([0-9]*[.])?[0-9]+', '1.0').group(0))"

You can check for text validation and also only one decimal point validation using isNaN

var val = $('#textbox').val();
var floatValues =  /[+-]?([0-9]*[.])?[0-9]+/;
 if (val.match(floatValues) && !isNaN(val)) {
  // your function
}