'Regex matching of character class and special conditions on certain other conditions

I want to match a section of a string that contains certain characters repeated, along with certain other characters only given a certain criteria. For instance matching characters a-z contained in angle brackets and numbers only if the number is preceeded by a plus.

Matching <abcde> to abcde.

<abcde1> should not match anything.

Matching <abcde+1> to abcde+1 Matching <abcde+1asd+2+3+4as> to abcde+1asd+2+3+4as

<abcde+> should not match anything.

The regex I've tried is <([a-z]|(\+(?=[0-9])|[0-9](?<=[\+])))*>.

regexmatching


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