javascript regex帮助

replace(/^(.*?)\s?\(([^)]+)\)$/gi, "$1$2")

$2

^   // From the start of the string
(   // Capture a group ($1)
.*? // That contains 0 or more elements (non-greedy)
)   // Finish group $1
\s? // Followed by 0 or 1 whitespace characters
\(  // Followed by a "("
(   // Capture a group ($2)
[   // That contains any characters in the following set
^)  // Not a ")"
]+  // One or more times
)   // Finish group $2
\)$ // Followed by a ")" followed by the end of the string.

x = "XJ FC-X35 (1492)"
x.replace(/\s*\(.*?\)/,'');