The possible values are...
1 (it will always start with a number)
1,2
4,6,10
views:
76answers:
5If it has to match at least one number, that should be a + rather than *
Tom Smilack
2010-10-05 04:26:24
100% correct smialck, I completely missed that. Thank you
phalacee
2010-10-05 04:29:47
In other way this same as a string of numbers contain comma not consecutive. Then first + can be omitted `(\d+,?)+` -> `(\d,?)+`
pinichi
2010-10-05 04:40:53
@pinichi: I don't understand what you mean
phalacee
2010-10-05 04:50:12
I mean that can be more shorter, Ex: "11,2" can be express as [(1)(1)(,)](2) in `(\d+,?)+` case and as (1)(1,)(2) in `(\d,?)+` also.
pinichi
2010-10-05 05:09:06
(\d,?)+ will only match single digit numbers (0,1,2,3,4,5,6,7,8,9) -- It won't match double-or-greater digit numbers: 10,12,23,100,45 my answer was "(one or more digits optionally followed by comma) one or more times"
phalacee
2010-10-05 06:09:28
It will match multiple digit numbers - "10," would be parsed as (1)(0,) - but i will also match a trailing comma
justintime
2010-10-05 08:01:24
+1
A:
This will do:
-?[0-9]+(,-?[0-9]+)*
Or, if you want to be pedantic and disallow numbers starting with 0 (other than 0 itself):
(0|-?[1-9][0-9]*)(,(0|-?[1-9][0-9]*))+
Floating-point numbers are left as an exercise to the reader.
Adam Rosenfield
2010-10-05 04:26:28
A:
Dear Sir, I concure with phalacee
" side note:"
would any one like to offer the solution for the thousand million -... format
This would be
(\d\d?\d?)*(\d\d\d)\\.(\*\d)
a set of quoted numbers for the case of natural number format like in english locale
"(\d\d?\d?)*(\d\d\d)\\.(\*\d)"*(,"(\d\d?\d?)*(\d\d\d)\\.(\*\d)")
Please correct me appropreatly
William Coleman
2010-10-05 04:27:41
You need to ask a separate question rather than posting an answer.
Bill the Lizard
2010-10-05 11:23:00
A:
You'll want
(?<=(?:,|^))\d+(?=(?:$|,))
Regex Buddy explains it as...
Assert that the regex below can be matched, with the match ending at this position (positive lookbehind) «(?<=(?:,|^))»
Match the regular expression below «(?:,|^)»
Match either the regular expression below (attempting the next alternative only if this one fails) «,»
Match the character "," literally «,»
Or match regular expression number 2 below (the entire group fails if this one fails to match) «^»
Assert position at the start of the string «^»
Match a single digit 0..9 «\d+»
Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Assert that the regex below can be matched, starting at this position (positive lookahead) «(?=(?:$|,))»
Match the regular expression below «(?:$|,)»
Match either the regular expression below (attempting the next alternative only if this one fails) «$»
Assert position at the end of the string (or before the line break at the end of the string, if any) «$»
Or match regular expression number 2 below (the entire group fails if this one fails to match) «,»
Match the character "," literally «,»
I would explain it as, "match any string of digits confirming that before it comes either the start of the string or a comma and that after it comes either the end of the string or a comma". nothing else.
The important thing is to use non-capturing groups (?:) instead of simply () to help overall performance.
Laramie
2010-10-05 04:39:29