Javascript 替换匹配组
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/11005991/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Javascript replace matched group
提问by Asherlc
I'm trying to build a text formatter that will add p and br tags to text based on line breaks. I currently have this:
我正在尝试构建一个文本格式化程序，它将根据换行符将 p 和 br 标签添加到文本中。我目前有这个：
s.replace(/\n\n/g, "\n</p><p>\n");
Which works wonderfully for creating paragraph ends and beginnings. However, trying to find
instances isn't working so well. Attempting to do a matched group replacement isn't working, as it ignores the parenthesis and replaces the entire regex match:
这对于创建段落结尾和开头非常有效。但是，尝试查找
实例效果不佳。尝试进行匹配组替换是行不通的，因为它会忽略括号并替换整个正则表达式匹配：
s.replace(/\w(\n)\w/g, "<br />\n");
I've tried removing the g option (still replaced entire match, but only on first match). Is there another way to do this?
我试过删除 g 选项（仍然替换整个匹配，但只在第一次匹配时）。有没有其他方法可以做到这一点？
Thanks!
谢谢！
回答by Paul
You can capture the parts you don't want to replace and include them in the replacement string with $followed by the group number:
您可以捕获不想替换的部分，并将它们包含在替换字符串中，$后跟组号：
s.replace(/(\w)\n(\w)/g, "<br />\n");
See this sectionin the MDN docs for more info on referring to parts of the input string in your replacement string.
回答by Guffa
Catch the surrounding characters also:
还要捕捉周围的字符：
s.replace(/(\w)(\n\w)/g, "<br />");
