我要把这个字符串
{{foobar bar
$aa bb=cc dd
$ee,ff=gg hh
$iiü jj=kk ll
}}
替换成：
{{foobar bar
$aa_bb=cc dd
$ee_ff=gg hh
$iiü_jj=kk ll
}}
目的是在 aa bb, ee,ff 和 iiü jj 之间添加下划线，
也就是在 $ 和 = 之间的字符除字母 ( ä,ö,ü,ß 等算有效字母) 外都要换成下划线。
基本功不行，google 到的也是一些简单的例子，希望高手相助，谢谢！
不高明解法一个
str1 = str.each_line.map do |line|
line.sub(/(?<=\$)(.*)(?==)/) do |match|
match.split.join('_')
end
end
p str1
saiga
#2
2016年01月08日
试一个
str.gsub(/(?<=^\$)(\p{Word}+)(?:\s*,\s*|\s+)(\p{Word}+)(?=\s*\=)/, '\1_\2')
Peter
#3
2016年01月08日
#1 楼 @nowherekai #2 楼 @saiga 谢谢两位，学到了
http://ruby-doc.org/core-2.1.1/Regexp.html
(?=pat) - Positive lookahead assertion: ensures that the following characters match pat, but doesn't include those characters in the matched text
(?<=pat) - Positive lookbehind assertion: ensures that the preceding characters match pat, but doesn't include those characters in the matched text
The (?:…) construct provides grouping without capturing. That is, it combines the terms it contains into an atomic whole without creating a backreference.