Regular expression to obtain value from [[text]]. I have tried the regex
"((?<=[[)*(?=]])*)+" the value between [[ ]] is not obtained.
For example, from the string [[text]], we should obtain text.
Pattern pat = Pattern.compile("((?<=\\[[)*(?=\\]])*)");
Matcher matcher = pat.matcher("[[text]]");
String next ="";
while(matcher.find()) {
next = matcher.group(0);
break;
}
System.out.println(next); //next should be text
You need to escape brackets [] when using them as actual characters in a regular expression. And you also need to add something to actually capture what is between the brackets. You can use .* for that or use my approach, if you are sure the value cannot contain a ].
((?<=\[\[)([^\]]*)(?=\]\]))+
There is not even really a need to use lookbacks und lookaheads unless you explictly need to exempt those limiters from the match. This will work just as well:
\[\[([\]]*\]\]
And obviously when you put these into a String, you need to add additional \ to escape the \ for the String...they are just more readable this way.
If you don't wanna get into regex, String.replaceAll can also help you.
String s2 = s.replaceAll("\\[", "").replaceAll("\\]", "");
"(?<=\\[\\[)[^\\]]*"
this should work for you
]characters?