On Jan 21, 2010, at 9:27 AM, John Campbell wrote:
> I want to find rows that contain a word that matches a term, accent
> insensitive: I am using utf8-general collation everywhere.
> attempt 1:
> SELECT * FROM t WHERE txt LIKE '%que%'
> Matches que qué, but also matches 'queue'
> attempt 1.5:
> SELECT * FROM t WHERE txt LIKE '% que %' OR LIKE 'que %' OR LIKE '% que';
> Almost, but misses "que!" or 'que...'
> SELECT * FROM t WHERE txt REGEXP '[[:<:]]que[[:>:]]'
> Matches que, not queue, but doesn't match qué.
> SELECT * FROM t WHERE txt REGEXP
> Matches que, queue, qué. (I have no idea why this matches queue, but
> the Regex behavior is bizarre with unicode.)
> Does anyone know why the final regex acts weird? It there a good solution?
The REGEXP and RLIKE operators work in byte-wise fashion, so they are not multi-byte safe
and may produce unexpected results with multi-byte character sets. In addition, these
operators compare characters by their byte values and accented characters may not compare
as equal even if a given collation treats them as equal.
Sun Microsystems / MySQL Documentation Team
Madison, Wisconsin, USA