regular expression

Question

Hi,

i want a help with an expression that matches only these numbers (0,0.00,.0000,000000,0.0000)

With Regards

Bikram

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litu Here

Answer 1

Hello There,

Please use below code

ValidationExpression="((\d+)+(\.\d+))$"

Cheers

Dinesh

Answer 2

Hi Dinesh

Thanks for the help but its not matching. Its matching with 1.0 but i want a match for 0, 0.00,.000 like this

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litu Here

Answer 3

Hello There,

Try below code

^[1-9]\d*(\.\d+)?$   OR

ValidationExpression="[0-9]*\.?[0-9]*"

Cheers

Dinesh

Answer 4

Hello There,

Please use below code

ValidationExpression="((\d+)+(\.\d+))$"

Cheers

Dinesh

That does not match '.0000'; please unpropose your answer. It also matches 0.0, 0.000 etc which should fail according to OP's description.

Answer 5

is it really needed to match (.0000), as per mathematics rule it is equal to (0.0000)

is it really a requirement

Answer 6

Hi Dinesh

Thanks for the help but its not matching. Its matching with 1.0 but i want a match for 0, 0.00,.000 like this

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litu Here

I'm not quite sure of your requirement, but your requirement seems to have changed from the original (e.g. '.000' instead of '.0000'). Below are a few examples that might cater for your needs.

^\d{0,1}(?:\.(\d\d)+?)$

This will match an optional digit (0-9) optionally followed by a dot followed by an even number of digits.

If your requirement is that the first digit (before the dot) can only be a zero (or non-existing), you can replace the first '\d' by '0'.

^0{0,1}(?:\.(\d\d)+?)$

If you're requirement is not that it needs to be an even number of digit after the decimal dot, you can replace '\d\d' by a single '\d'.

^\d{0,1}(?:\.(\d)+?)$

If your requirement is that you only want to know if the number is zero (as in 0, .0, .00, 0.000 etc), you can replace every '\d' by a '0'.

^0{0,1}(?:\.(0)+?)$

I think you will be able to derive your own one from the above if they do not cater exactly from your needs.

Answer 7

It looks like your pattern should be something like this...

0+(\.0+)?|\.0+

This will accept any number of zeroes and optionally one decimal -- but not a decimal with no zeroes after it, and not a decimal by itself, and not the empty string.

Here's how you could be more helpful in describing your requirements.  Some additional edge cases that you should explicitly indicate as being valid or not are the following:

• ""
• "."
• "0."
• "00.0"

I also recommend using the web app at debuggex.com to help design and debug your regular expressions.