I have a large String in which I have & characters used available in following patterns -
A&B
A & B
A& B
A &B
A&B
A & B
A& B
A &B
I want to replace all the occurrences of & character to &
While replacing this, I also need to make sure that I do not mistakenly convert an &
to &
. How do I do that in a performance savvy way? Do I use regular expression? If yes, please can you help me to pickup the right regular expression to do the above?
I've tried following so far with no joy:
data = data.replace(" & ", "&"); // doesn't replace all &
data = data.replace("&", "&"); // replaces all &, so & becomes &
You can use a regular expression with a negative lookahead.
The regex string would be &(?!amp;)
.
Using replaceAll
, you would get:
A&B
A & B
A& B
A &B
A&B
A & B
A& B
A &B
So the code for a single string str
would be:
str.replaceAll("&(?!amp;)", "&");