Java正则表达式：根据先前字符匹配字符

Question

How to match a closing quote (single or double) depending on opening quote used?

For now I have:

key.*?=["'].*?["']

But unfortunately the closing quote is not dependent on the opening one and it won't work for the following example:

key="foo'bar"

I could created 2 sub but I assume that it isn't optimal:

key.*?=(".*?"|'.*?')

Any hint would be greatly appreciated, thanks!

Answer 1

You can use back reference \\n (eg \\1 - for the first capturing group, \\2 for the second)

So your example would look like:

key.*?=(["']).*?\1