Question

Need a regular expression to match a FLOAT greater than a given number

Asked by: SiriusPhil

I have a float value... say 1.3.  I need to use a regular expression to validate a float value greater than 1.3  

500 points to the person who provides me the solution

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Asked On
2008-02-19 at 09:30:49ID23175042
Topic

Regular Expressions

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: mkatmonkeyPosted on 2008-02-19 at 10:00:42ID: 20930803

You should consider parsing out the float first and then validating that the value is greater than 1.3. Otherwise, your regular expression will be somewhat complicated:


Why do you want to use regular expressions for this validation?

#Match a float greater then or equal to two:
(\+|\-){0,1}[2-9]+[0-9]*\.{0,1}[0-9]*
 
#Match a float greater then 1.3 but less then 2.
 
(\+|\-){0,1}1\.[4-9]+[0-9]*
 
#Match a float greater then 1.3 but less then 1.4
 
(\+|\-){0,1}1\.3[0-9]*[1-9]+[0-9]*
 
#You can now combine these to make a very unreadable regular expression:
((\+|\-){0,1}[2-9]+[0-9]*\.{0,1}[0-9]*|(\+|\-){0,1}1\.[4-9]+[0-9]*|(\+|\-){0,1}1\.3[0-9]*[1-9]+[0-9]*)
                                              
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by: ddrudikPosted on 2008-02-19 at 10:04:30ID: 20930846

1\.[4-9]\d+|(?:[2-9]|\d{2,}\.\d+

Assuming you want to require at least one decimal place.

 

by: ddrudikPosted on 2008-02-19 at 10:05:23ID: 20930855

err, missing parens:
^1\.[4-9]\d+|(?:[2-9]|\d{2,})\.\d+$

 

by: SiriusPhilPosted on 2008-02-19 at 10:09:31ID: 31432216

You are right... I found a much better way to validate this...  But thank you.

Using regular expressions to validate an ever changing float is a nightmare.

I was hoping I was missing something.

20120131-EE-VQP-002

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