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javaregexqregexp

String pattern finding, Is Regex Applicable to my requirement?

I am trying to find some string pattern (`"isempty var0")out of some long String which i am getting while reading a file, i am not sure if Regex Applicable to my requirement?

To be more precise in the expected String pattern isempty is a keyword and there would be some java variable next to it after some space.

Input Strings can be something like this:

"isempty var0 && v1== 56"
"v2 == 50 || isempty var1"
"Q3 == 100 || (isempty var2)"
"isempty var3"
"is thisnotisempty var4"

And expected output is: 

"isempty var0"
"isempty var1"
"isempty var2"
"isempty var3"
 null

Currently i am trying to find the pattern using String.contains(), String.CharAt(), String.indexOf() methods etc.

Though i am not sure if this can be solved with Regex?? If it can be can someone give some idea, What could be the Regex to find this kind of pattern?

Thanks!

Solution

  • Try this:

    \bisempty\s+\w+

    Online demo.