newbie question: non numeric non whitespace value

I want to detect whether the java String has any non-numeric
and non-
whitespace char. For example, "12 34" returns
false, "1234" returns
false, "12a3" returns true, "a 12 3"
returns true, etc. What's the
regex for that? Can I use [^0-9\s]? If not, what does it
mean?


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D is the opposite of d, and S is the opposite of s. If
I
understand your requirement correctly, [^ds] should be the
same as
[DS]


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your requirement for detecting

**any non-numeric AND non-whitespace char**

leads to evaluating ALL your sample strings as TRUE, b/c
every string
in the list

"12 34"
"1234"
"12a3"
"a 12 3"

is comprised of a series of non-numeric (D) and non-
whitespace (S)
char. For exampl, str "12 34" consists of 4 S
chars : 1234 and 1 D
char, i.e the whitespace. That evaluates the str as TRUE
according to
your requirement above. So there is a constradiction between
your
requirements and your anticipated flag (FALSE) for this
string.

U need to tweak your logic, restate the requirement/rules
for
validation, and make another run at this.


On Feb 8, 3:46 pm, "u...yahoo.com"
<u...yahoo.com> wrote:
> I want to detect whether the java String has any
non-numeric and non-
> whitespace char. For example, "12 34" returns
false, "1234" returns
> false, "12a3" returns true, "a 12
3" returns true, etc. What's the
> regex for that? Can I use [^0-9\s]? If not, what does
it mean?


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On Feb 8, 3:46 pm, "u...yahoo.com"
<u...yahoo.com> wrote:
> I want to detect whether the java String has any
non-numeric and non-
> whitespace char. For example, "12 34" returns
false, "1234" returns
> false, "12a3" returns true, "a 12
3" returns true, etc. What's the
> regex for that? Can I use [^0-9\s]? If not, what does
it mean?

If these strings are standalone, then you might try the
lookahead
construct, i.e.:

  (?=.*[^\d\s])

I dont know Java though, in Perl, the regex a test code is
like:

bash ~$ echo '12 34
1234
12a3
a 12 3' | perl -lne 'print "true: $_"
if/(?=.*[^ds])/'

this prints:
____________
true: 12a3
true: a 12 3

Xicheng


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On Feb 10, 8:40 pm, "SlideGuitar" <d...anthonynassar.com> wrote:
> D is the opposite of d, and S is the opposite of s.
If I
> understand your requirement correctly, [^ds] should
be the same as
> [DS]

Hi, Tony, I guess you had a small mistake in this post.
[DS] is not
the same as [^ds].  [DS] actually contains all the
characters(the
same as [Ss]), since 's' is a subset of 'D'. 

Best regards,
Xicheng


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Quite right! [DS] is a union. That's definitely not what
we want. My
apologies; if I'm in a hurry, I shouldn't post.


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Your requirement is still not clear. Do you *want* the
string to
contain *only* numeric or whitespace characters, so the
first
character which is both *non-numeric* and *non-whitespace*
will
invalidate it? I assume there's a find() method; I'm not
going to look
up the relevant javadocs. If you can find [^ds] within the
input
string, then the string is invalid. Here I'm leaving out the
extra
slash to escape the slash character itself in a Java string
literal.


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On Feb 12, 10:02 am, "SlideGuitar" <d...anthonynassar.com> wrote:
> Your requirement is still not clear. Do you *want* the
string to
> contain *only* numeric or whitespace characters, so the
first
> character which is both *non-numeric* and
*non-whitespace* will
> invalidate it? I assume there's a find() method; I'm
not going to look
> up the relevant javadocs. If you can find [^ds]
within the input
> string, then the string is invalid. Here I'm leaving
out the extra
> slash to escape the slash character itself in a Java
string literal.

I guess the OP's logic is: given an input string,
   if it contains only numbers or whitespaces(like
^[ds]+$), then
return false
   otherwise, return true.

>From my understanding, it's kind of like a negation of
the regex ^[d
s]+$. so '12 34' and '1234' are false, coz there are only
numbers and
spaces in the string.  but '12a3' and 'a 12 3' are true
since 'a' is
neither a 'number' nor a 'whitespace'..

If the above is true, then I think, [^0-9\s] in the OP's
post is
actually proper and enough for this need. 

Regards,
Xicheng


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