Possessive quantifiers in Regex patterns like below improve performance by eliminating needless backtracking:

?+ , *+ , ++ , {n}+ , {n,}+ , {n,m}+

But because possessive quantifiers do not keep backtracking positions and never give back, the following sub-patterns should not match only similar characters. Otherwise, possessive quantifiers consume all characters that could have matched the following sub-patterns and nothing remains for the following sub-patterns.

Noncompliant Code Example

"/a++abc/"              // Noncompliant, the second 'a' never matches
"/\d*+[02468]/"         // Noncompliant, the sub-pattern "[02468]" never matches

Compliant Solution

"/aa++bc/"              // Compliant, for example it can match "aaaabc"
"/\d*+(?<=[02468])/"    // Compliant, for example it can match an even number like "1234"