(?<!abc)n
(?<!abc)n is defined as: Negative Lookbehind to match n only if abc not exist before. Topics on: . Read more: JS, JS Language, Object, Reg Exp, Reg Exp Syntax,
(?<!abc)n is defined as: Negative Lookbehind to match n only if abc not exist before. Topics on: . Read more: JS, JS Language, Object, Reg Exp, Reg Exp Syntax,
(?<=abc)n is defined as: Positive Lookbehind Assertion to match n only if abc exists before. Topics on: . Read more: JS, JS Language, Object, Reg Exp, Reg Exp S