Hello, @alan-kilborn, @maria-nita and All,
Alan, the first answer of this stackoverflow’s topic is really the best one ;-))
Indeed ! At first sight, although that, in OP text , word CAT always precedes the word DOG, I thought about the search regex, below :
^.*(CAT).*(DOG).*|^.*(?2).*(?1).*
However, the syntax ^(?=.*CAT)(?=.*DOG).* is really more elegant !
We can generalize to any number of words and, also, add conditions which should not occur ;-)) . For instance, the following regex would match all lines, with their line-breaks, which :
Contain the 3 expressions WORD_1 AND WORD_2 AND WORD_5
Does NOT contain the 2 expressions WORD_4 OR WORD_6
(?-s)^(?=.*WORD_1)(?=.*WORD_2)(?=.*WORD_5)(?!.*WORD_4)(?!.*WORD_6).*\R
So, it matches the lines 5, 12 and 14, only, in the text :
This line 1 contains WORD_1 WORD_2
This line 2 contains WORD_1 WORD_3 WORD_5
This line 3 contains WORD_3 WORD_5 WORD_4
This line 4 contains WORD_1 WORD_5
This line 5 contains WORD_5 WORD_2 WORD_1
This line 6 contains WORD_2 WORD_1 WORD_6 WORD_5
This line 7 contains WORD_4 WORD_1 WORD_5
This line 8 contains WORD_2
This line 9 contains WORD_5 WORD_2 WORD_4 WORD_7 WORD_1
This line 10 contains WORD_1 WORD_6 WORD_2
This line 11 contains WORD_4 WORD_2 WORD_1, WORD_5 WORD_6
This line 12 contains WORD_7 WORD_2 WORD_5 WORD_1
This line 13 contains WORD_6 WORD_2 WORD_1 WORD_5
This line 14 contains WORD_1 WORD_5 WORD_8 WORD_2 WORD_3
Best Regards,
guy038
