javascript - 正则表达式非捕获组问题

Question

为什么以下返回 ["vddv"] 而不是 ["dd"]:

"aaavddv".match(/(?:v).*(?:v)/)

Answer 1

(?:v) # matches 'v' this is a non-capturing group, not a lookbehind
.*    # matches 'dd'
(?:v) # matches 'v' this is a non-capturing group, not a lookahead

非捕获组仍然参加比赛。也许你想要向前看/向后看？但是 Javascript 不支持 lookbehind。