Regular Expression

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

I have a textbox and want to allow my user to enter negative or positive
decimal values.

I want to do 2 things:

1) Only allow the user to type one minus sign (-)
2) Only allow the user to enter one point (.)

I would like to do this using Javascript or a Regular Expression.

Anyone got something that does this already?
 
^(-)?[0-9]+(\.[0-9]+)?$

That should do it - it will also prevent a decimal point if there's no
digits after.
 
Slight revision:

^(-)?\d*\.?\d+$

Besides being a bit more succint, it allows a number that starts with a dot,
such as ".1" without a preceding digit.

--
HTH,

Kevin Spencer
Microsoft MVP

Printing Components, Email Components,
FTP Client Classes, Enhanced Data Controls, much more.
DSI PrintManager, Miradyne Component Libraries:
http://www.miradyne.net

Keith said:
^(-)?[0-9]+(\.[0-9]+)?$

That should do it - it will also prevent a decimal point if there's no
digits after.

C said:
I have a textbox and want to allow my user to enter negative or positive
decimal values.

I want to do 2 things:

1) Only allow the user to type one minus sign (-)
2) Only allow the user to enter one point (.)

I would like to do this using Javascript or a Regular Expression.

Anyone got something that does this already?
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