Regular Expressions Matching on multiple separated characters

Question

In this string:

"<0> <<1>> <2>> <3> <4>"

I want to match all instances of "<\d{1,2}>" except those I have escaped with an extra set of triangle brackets, e.g., I want to match 0,2,3,4 but not 1, e.g.:

"<0> <<1>> <2>> <3> <4>"

I want to do this in one single regular expression but the best I could get is:

(^|[^\<])\<(?<1>\d{1,2})>([^>]|$)

Which will match 0,3,4 but not 2, e.g.:

"<0> <<1>> <2>> <3> <4>"

Does anyone know how this can be done with a single regular expression?

Answer 1

You can also try conditionals: (?(?<=<)(<\d{1,2}>(?!>))|(<\d{1,2}>))