Numbers & Whitespace Help!

[digitalje]

Hi All,

Just a quick question...

Is there a regular expression that I could use that would fail if a
number has a white space(s)embedded in it?

For example:

1.5 <-- Should pass as a valid number
1 .5 <-- Should fail since there is a white space in between the 1
and decimal.

Any help would be greatly appreciated!

Thanks,
J E

 

[Sherm Pendley]

Hi All,

Just a quick question...

Is there a regular expression that I could use that would fail if a
number has a white space(s)embedded in it?

For example:

1.5 <-- Should pass as a valid number
1 .5 <-- Should fail since there is a white space in between the 1
and decimal.

Any help would be greatly appreciated!

There are a number of docs included with Perl that explain regexes. Have a
look at:

perldoc perlrequick
perldoc perlretut
perldoc perlre

sherm--

 

[Jürgen Exner]

Is there a regular expression that I could use that would fail if a
number has a white space(s)embedded in it?

For example:

1.5 <-- Should pass as a valid number
1 .5 <-- Should fail since there is a white space in between the 1
and decimal.

Well, that is not a number.
Do you mean "if a string contains a white space"? Sure, m/\s/

 

[digitalje]

Thanks...

Well, that is not a number.
Do you mean "if a string contains a white space"? Sure, m/\s/

 

[Dave]

Hi All,

Just a quick question...

Is there a regular expression that I could use that would fail if a
number has a white space(s)embedded in it?

For example:

1.5 <-- Should pass as a valid number
1 .5 <-- Should fail since there is a white space in between the 1
and decimal.

Any help would be greatly appreciated!

Thanks,
J E

See my answer to Regular Expression for Integer and float values below

 

[digitalje]

Found the expresssion, this seems to work:

^[0-9]*\.{0,1}[0-9]*$

Thanks to everybody.

 

[digitalje]

Shorter and neater:

^\d*\.{0,1}\d*$

Found the expresssion, this seems to work:

^[0-9]*\.{0,1}[0-9]*$

Thanks to everybody.

See my answer to Regular Expression for Integer and float values below

 

[Paul Lalli]

Shorter and neater:

^\d*\.{0,1}\d*$

You understand that each of the following would pass this test, right?

"5."
"."
".4"
".0000"
""

Paul Lalli

 

[Dr.Ruud]

digitalje schreef:

Is there a regular expression that I could use that would fail if a
number has a white space(s)embedded in it?

Why only reject internal whitespace and not other unwanted characters?

See Regexp::Common, more specifically Regexp::Common::number.

 

[digitalje]

Hey Paul,

Didn't think about the ".". Thanks for picking that up.

The other items are ok. I am converting the string into a number after
validating and the process is smart enough to know that:

5. --> 5.0
..4 --> 0.4

etc...

Thanks.