Question

Every RegExp is slightly different. When it comes to Pig’s match functionality, does:

X = FILTER A BY (f1 matches 'apache');

==

X = FILTER A BY (f1 matches '^apache$');

or

X = FILTER A BY (f1 matches '.*apache.*');

? In other words, is .* automatically implied in a match or does it always need to be included?

Answer 1

The format of regular expressions in Pig is that supported by Java as described here.

In other words, nothing is implied, if you want .* you have to specifically add it to the matches statement just like you would do in Java in a Pattern.compile.