perl -ne 'print if (/SPACE/i && /Camp/i )' file.txt 

cat file.txt | perl -ne 'print if (/SPACE/i && /Camp/i )'

cat file.txt | awk 'BEGIN{IGNORECASE=1} /Space/ && /Camp/' 

cat file.txt | grep -i -E 'Space.*CAMP|Camp.*SPacE'



time (cat file.txt | perl -ne 'print if (/SPACE/i && /Camp/i )')
real    0m0.045s
user    0m0.037s
sys     0m0.013s

time (cat file.txt | awk 'BEGIN{IGNORECASE=1} /Space/ && /Camp/' )
real    0m0.043s
user    0m0.029s
sys     0m0.019s