java - Seemingly Pointless Regex Found in Code -


so inherited code , looking through code found regex seems allow pretty string. regex is:

^(?=\\s*\\s).*$

this on field saved database thought maybe doing basic sql injection protection. thoughts? can tell checking there start\end of line, have positive lookahead white space or non-white space character, , allowing characters. 

^(?=\\s*\\s).*$

this says there cannot empty string.there has 1 non space character.so string ' ' not pass neither "".

this similar ^.*\s.*$.lookaheads expensive can use this.


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