vscode regex replace

question:

replace following line in left to its right part.

[SYS_write]   sys_write,    -> [SYS_write]   "write",

solution:

find regex:         ](\s*)sys_(\w+),

replace regex:   ]$1"$2",

use $1 to refer match group.

note in notepad++, it use \1 to refer match group.