Another Reg Exp problem

[Larry Bud]

Alright, I don't have time to learn all the intricacies of regular
expressions, but what I want to do is match a string that has:

1) only digits
2) may have a comma
3) must not start or end with a comma

So basically, a string of numbers separated with commas. valid input
could be

123
123,124
123,125,125
1,2,3
1,12,123

Invalid would be

123,
,123
123 124 125
123abc

TIA!

[kaeli]

Re: Another Reg Exp problem

In article <5db363e0.04052 40946.41baabd8@ posting.google. com>,
larrybud2002@ya hoo.com enlightened us with...[color=blue]
> Alright, I don't have time to learn all the intricacies of regular
> expressions, but what I want to do is match a string that has:
>
> 1) only digits
> 2) may have a comma
> 3) must not start or end with a comma
>
> So basically, a string of numbers separated with commas. valid input
> could be
>[/color]

Try
/^\d[,\d]*$/

--
--
~kaeli~
Murphy's Law #2030: If at first you don't succeed, destroy
all evidence that you tried.

http://www.ipwebdesign.net/wildAtHeart

http://www.ipwebdesign.net/kaelisSpace

[Lasse Reichstein Nielsen]

Re: Another Reg Exp problem

kaeli <tiny_one@NOSPA M.comcast.net> writes:
[color=blue][color=green]
>> 1) only digits
>> 2) may have a comma
>> 3) must not start or end with a comma[/color][/color]
[color=blue]
> Try
> /^\d[,\d]*$/[/color]

This can end with a comma. You probably mean
/^\d+(,\d+)*$/

Hmm. In fact, the original poster didn't say that the string must be
non-empty, so a more correct solution would be:
/^(\d+(,\d+)*)?$/

/L
--
Lasse Reichstein Nielsen - lrn@hotpop.com
DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleD OM.html>
'Faith without judgement merely degrades the spirit divine.'

[Lee]

Re: Another Reg Exp problem

Larry Bud said:[color=blue]
>
>Alright, I don't have time to learn all the intricacies of regular
>expressions, but what I want to do is match a string that has:
>
>1) only digits
>2) may have a comma
>3) must not start or end with a comma
>
>So basically, a string of numbers separated with commas. valid input
>could be
>
>123
>123,124
>123,125,125
>1,2,3
>1,12,123
>
>Invalid would be
>
>123,
>,123
>123 124 125
>123abc[/color]

If there must be at least two digits, then it's easy:
/^\d+[,\d]*\d$/

That's a digit at the beginning, any number of [comma or digit],
followed by a digit at the end.

If a single digit is also valid, then it's only a little more complicated:

/(^\d+[,\d]*\d$)|(^\d$)/

That's the same as above OR just one digit.

[Lee]

Re: Another Reg Exp problem

kaeli said:[color=blue]
>
>In article <5db363e0.04052 40946.41baabd8@ posting.google. com>,
>larrybud2002@y ahoo.com enlightened us with...[color=green]
>> Alright, I don't have time to learn all the intricacies of regular
>> expressions, but what I want to do is match a string that has:
>>
>> 1) only digits
>> 2) may have a comma
>> 3) must not start or end with a comma
>>
>> So basically, a string of numbers separated with commas. valid input
>> could be
>>[/color]
>
>Try
>/^\d[,\d]*$/[/color]

That could end with a comma

[kaeli]

Re: Another Reg Exp problem

In article <3c5pn0uv.fsf@h otpop.com>, lrn@hotpop.com enlightened us
with...[color=blue]
> kaeli <tiny_one@NOSPA M.comcast.net> writes:
>[color=green][color=darkred]
> >> 1) only digits
> >> 2) may have a comma
> >> 3) must not start or end with a comma[/color][/color]
>[color=green]
> > Try
> > /^\d[,\d]*$/[/color]
>
> This can end with a comma. You probably mean
> /^\d+(,\d+)*$/
>[/color]

So close, and yet so far. :)
I'll get regex eventually.


--
--
~kaeli~
Support your local medical examiner: die strangely!

http://www.ipwebdesign.net/wildAtHeart

http://www.ipwebdesign.net/kaelisSpace

[Larry Bud]

Re: Another Reg Exp problem

Lee <REM0VElbspamtr ap@cox.net> wrote in message news:<c8te5r01r tl@drn.newsguy. com>...[color=blue]
> Larry Bud said:[color=green]
> >
> >Alright, I don't have time to learn all the intricacies of regular
> >expressions, but what I want to do is match a string that has:
> >
> >1) only digits
> >2) may have a comma
> >3) must not start or end with a comma
> >
> >So basically, a string of numbers separated with commas. valid input
> >could be
> >
> >123
> >123,124
> >123,125,125
> >1,2,3
> >1,12,123
> >
> >Invalid would be
> >
> >123,
> >,123
> >123 124 125
> >123abc[/color]
>
> If there must be at least two digits, then it's easy:
> /^\d+[,\d]*\d$/
>
> That's a digit at the beginning, any number of [comma or digit],
> followed by a digit at the end.
>
> If a single digit is also valid, then it's only a little more complicated:
>
> /(^\d+[,\d]*\d$)|(^\d$)/
>
> That's the same as above OR just one digit.[/color]

Damn, I DID forget to add that it cannot be empty. Will this work for it as well?

What if someone enters

1,,23

There shouldn't be two commas in a row.

[Dr John Stockton]

Re: Another Reg Exp problem

JRS: In article <5db363e0.04052 40946.41baabd8@ posting.google. com>, seen
in news:comp.lang. javascript, Larry Bud <larrybud2002@y ahoo.com> posted
at Mon, 24 May 2004 10:46:58 :[color=blue]
>Alright, I don't have time to learn all the intricacies of regular
>expressions, but what I want to do is match a string that has:
>
>1) only digits
>2) may have a comma
>3) must not start or end with a comma
>
>So basically, a string of numbers separated with commas.[/color]

And non-empty.

So you want a digit, followed by any number, including zero, of comma-
followed-by-at-least-one-digit - and nothing else.

OK = /^(\d+)(,\d+)*$/.test(S)

Tested in
<URL:http://www.merlyn.demo n.co.uk/js-valid.htm>
<URL:http://www.merlyn.demo n.co.uk/js-quick.htm>

OK = /^(\d+,)*(\d+)$/.test(S)

should also do. In each case, the parentheses around just \d+ are
superfluous.

--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 IE 4 ©
<URL:http://jibbering.com/faq/> Jim Ley's FAQ for news:comp.lang. javascript
<URL:http://www.merlyn.demo n.co.uk/js-index.htm> jscr maths, dates, sources.
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[Thomas 'PointedEars' Lahn]

Re: Another Reg Exp problem

Larry Bud wrote:
[color=blue]
> Lee <REM0VElbspamtr ap@cox.net> wrote:[color=green]
>> Larry Bud said:[color=darkred]
>>> Alright, I don't have time to learn all the intricacies of regular
>>> expressions, but what I want to do is match a string that has:
>>>
>>> 1) only digits
>>> 2) may have a comma
>>> 3) must not start or end with a comma
>>> [...][/color]
>>
>> If there must be at least two digits, then it's easy: /^\d+[,\d]*\d$/
>> [...]
>> If a single digit is also valid, then it's only a little more
>> complicated:
>>
>> /(^\d+[,\d]*\d$)|(^\d$)/
>>
>> That's the same as above OR just one digit.[/color]
>
> Damn, I DID forget to add that it cannot be empty. Will this work for it
> as well?[/color]

No.
[color=blue]
> What if someone enters
>
> 1,,23[/color]

It would be accepted using the above RegExp. /\d+/ matches "1",
/[,\d]*/ matches ",,2" and the final /\d/ matches "3" then.
[color=blue]
> There shouldn't be two commas in a row.[/color]

I think you are looking for /^(\d(,\d)?)+$/. Could be written as
/^(\d,\d|\d)+$/ as well. It remains to be discussed what of them
is more efficient.


HTH

PointedEars