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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.
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A regular expression for a decimal number needs to checks for one or more numeric characters (0-9) at the start of the string, followed by an optional period, and then followed by zero or more numeric characters (0-9). This should all be followed by an optional plus or minus sign.
[0-9]+|[0-9]+). This regular expression matches an optional sign, that is either followed by zero or more digits followed by a dot and one or more digits (a floating point number with optional integer part), or that is followed by one or more digits (an integer).
To extract a floating number from a string with Python, we call the re. findall method. import re d = re. findall("\d+\.
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))" 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
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