CODEWITHSUNDEEP
autocompleteredis
Glen Selle
Glen Selle

Reputation: 3946

How to imitate autocomplete search with Redis ZRANGEBYLEX?

I'm trying to make a simple autocomplete system much like the demo here: http://autocomplete.redis.io/ but for some reason I can't get the ZRANGEBYLEX to return the right results. Here's what I'm doing on the Redis CLI:

> zadd autocomplete 0 one 0 two 0 three 0 four 0 five 0 six 0 seven 0 eight 0 nine 0 ten 0 eleven 0 twelve 0 thirteen 0 fourteen 0 fifteen

My set looks good:

> zrangebylex autocomplete - +
1) "eight"
2) "eleven"
3) "fifteen"
4) "five"
5) "four"
6) "fourteen"
7) "nine"
8) "one"
9) "seven"
10) "six"
11) "ten"
12) "thirteen"
13) "three"
14) "twelve"
15) "two"

And if I use ZRANGEBYLEX like this the result makes sense:

zrangebylex autocomplete [e [eight
1) "eight"

But if I want to get all items in the set that start with an "e" I try this (which is very similar to what the autocomplete demo shows) but it doesn't return the right results:

> zrangebylex autocomplete [e [e(0xff)
(empty list or set)

What must one use as params to the ZRANGEBYLEX command in order for it to match any strings beginning with "e" and anything else afterwards?

Upvotes: 13

Views: 4655

Answers (1)

Itamar Haber
Itamar Haber

Reputation: 50112

This will do the trick:

127.0.0.1:6379> zrangebylex autocomplete [e "[e\xff"
1) "eight"
2) "eleven"

Edit: As noted by Itamar Haber in his comment below, when using a code client, you do not need quotes.

Upvotes: 20

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