请问如何用正则表达式批量替换画板和图层名称？

[suhehe]

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• OS Version: macOS (10.12.x)
• Sketch Version: v44.1+

Issues below

OS Version: macOS (10.13.6)
Sketch Version: v52.2
如下两图，我想把图层名的空格替换成下划线，这样写不对吗？请问正确的写法是怎样？谢谢了