CODEWITHSUNDEEP
javajavascriptregexregex-negation
Girish Reddy Irala
Girish Reddy Irala

Reputation: 57

Regular expression for specific pattern

Could anybody help me with regular expression as mentioned.

I have an xml element 'docs' which has an attribute 'range' where range should take only values in the below format.

range = "1,2,3,4,5"

or

range = "1,2,3-6,10-12,15,20-30"

or

range = "all"

A littel help will be much appreciated. Thanks in advance.

Upvotes: 1

Views: 210

Answers (3)

Jack
Jack

Reputation: 5768

^\d(?!.*,-)[\d\,\-]*\d$|^all$|^\d+$

Should work for your numbers. Input can only be numbers, commas, or dash or the word all.

http://regexr.com?30p7f

Upvotes: 3

Abdullah Jibaly
Abdullah Jibaly

Reputation: 54790

As @minopret mentioned, this is probably best not handled completely with regex. I would split(",") the strings and then iterate over the resulting array to make sure that they are in ascending order. You can regex each of the individual array elements at that point to make sure they match something like:

\d+(-\d+)?

Upvotes: 1

minopret
minopret

Reputation: 4806

all|[1-9][0-9]*(-[1-9][0-9]*)?(,[1-9][0-9]*(-[1-9][0-9]*)?)*

I have assumed that zero and leading zeroes are not permitted.

Regular expressions are not a good way to ensure that numbers are in ascending order.

Upvotes: 2

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