What’s a better regex for detecting floats?

0
3
Asked By CuriousCat123 On

I'm trying to improve my regex for identifying float numbers. The current regex I have is `^-?(d+.d*|d*.d+)$`, which works for cases like `-90.`, `.67`, and `42.6`. However, it doesn't accept inputs like `.` or `-.`, and I'm wondering if there's a better way to handle digits before and after the decimal point while ensuring at least one digit is present. Any suggestions?

5 Answers

Answered By RegexWhiz On

Instead of relying solely on regex, consider using the built-in string-to-float conversion of your programming language. If it fails, you can handle the exception. Some languages even have methods like TryParse() that can cleanly check if something can be converted to a float without throwing an error. This keeps things efficient without complicated regex.

DataCleaner -

If you're cleaning data for another system, make sure you check what float formats it accepts first, then use the built-in methods to validate and convert.

ThoughtfulCoder -

I love that out-of-the-box thinking!

Answered By RegexFanatic On

Your regex is decent. Just remember, there are multiple ways to define floats in regex. You might need to consider options for scientific notation, like `1.3e3`, too. Also, keep in mind cases where a float can be presented without a decimal, like `10` which is still a valid float.

PrecisionSeeker -

For sure! It's good to think about variations and not just stick to one style.

Answered By ExtensiveRegex On

Here's another version that matches a valid float while ensuring there's at least one digit on either side of the decimal: `^-?(d+?.d*|.d+)$`. This will prevent false positives like `-` or `.` as valid floats.

Answered By FloatCritic On

Your regex would match things like `005.12`, which isn’t typically how floats are expressed. It also allows for odd formats like `2.`, which might indicate input errors. Consider refining your criteria for what constitutes a valid float.

Answered By FloatFinder On

If you're looking for readability, try something like `^-?d*(d.|.d)d*$`. It’s simpler and covers the need for at least one number on either side of the decimal.

RegexEnthusiast -

Thanks for the suggestion! I definitely lean towards the more readable approach.

Related Questions

LEAVE A REPLY

Please enter your comment!
Please enter your name here

This site uses Akismet to reduce spam. Learn how your comment data is processed.