我发现我的go项目中的regexp替换速度非常慢，\ s +使用regexp.ReplaceAllLiteralString（re2）替换为单个空格。
显然在SVG中存在崩溃的空白，不管这是不是一个好主意，当改为“{2，}”时，操作只有时间的十分之一。
虽然使用\ s vs''是一个公平的区别 - 但这是有道理的，它是比较的5倍。但是为什么当使用单个空格和+时，它比使用{2，}？
慢9倍答案 0 :(得分：0)
X+ means "every instance of X that occurs once or more", which means it's equivalent to {1,}. You're replacing (a single blank) as well as when using \s+.
For an SVG document, or any XML document for that matter, using \s+ is bound to be slow. The following document would require 5 replacements, ignoring newline sequences:
<?xml version="1.0" encoding="utf-8"?>
<element attr1="value" attr2="value" attr3="value"/>
Now imagine an SVG document that is so much more complex, and it's reasonable that something like \s{2,} would be a lot faster than \s+ (a.k.a. \s{1,})! There'd be 0 replacements in the document above if you used \s{2,}!