如何双引号双引号？

Question

Say I have this String in java:

This a "text". This is inches 30". And another 20\"

I want to find all inches (double quotes after a number) and add a second escape for it, if it doesn't have yet.

So after the change, the string would be like this, printed in console:

This is a "text". This is inches 30\". And another 20\"

So the regex must check if there is a number before the double quote and if there is not a escape character already...

thanks!!

Answer 1

Try with Positive Lookbehind

String str="This a \"text\". This is inches 30\". And another 20\\\"";
System.out.println(str.replaceAll("(?<=\\d)\"", "\\\\\""));

output:

This a "text". This is inches 30\". And another 20\"

---

Here is Online demo as well.

Pattern explanation:

  (?<=                     look behind to see if there is:
    \d                       digits (0-9)
  )                        end of look-behind
  \"                       '"'

Answer 2

         x='This a "text". This is inches 30". And another 20\"'
         print re.sub(r"(\d+)(\")",r"\1\\\2",x)

This is in python.I dont know the exact match for java.