我正在尝试构建一个正则表达式,以便在bigquery中的表中找到一个可以包含重音符号的单词。输入可能有重音符号。我在scala中对它进行编码,因此可以使用scala或使用bigquery函数来转换输入。我想一个好的解决方案可能是这样的:
input: serie
word to find: Séries
我可以在
中转换输入r'(?i:s[éèe]r[íìi][éèe]s)'
但我认为最好将表格的列转换为:
r'(?i:s[ée]ries)'
我不知道如何解决第二种情况,或者是否有更好的解决方法。 提前致谢
答案 0 :(得分:1)
我正在尝试构建一个正则表达式,以便在bigquery中的表中找到一个可以包含重音符号的单词。
播放以下示例
所以输入可以在scala中转换或使用bigquery函数
它完成了BigQuery Standard SQL中的所有内容
#standardSQL
CREATE TEMP FUNCTION latin2accents(word STRING) AS
((
WITH lookups AS (
SELECT
'y,a,e,i,o,u,c,ç,n,æ,œ,á,é,í,ó,ú,à,è,ì,ò,ù,ä,ë,ï,ö,ü,ÿ,â,ê,î,ô,û,å,ø,Ø,Å,Á,À,Â,Ä,È,É,Ê,Ë,Í,Î,Ï,Ì,Ò,Ó,Ô,Ö,Ú,Ù,Û,Ü,Ÿ,Ç,Æ,Œ,ñ' AS accents,
'y,a,e,i,o,u,c,c,n,ae,oe,a,e,i,o,u,a,e,i,o,u,a,e,i,o,u,y,a,e,i,o,u,a,o,O,A,A,A,A,A,E,E,E,E,I,I,I,I,O,O,O,O,U,U,U,U,Y,C,AE,OE,n' AS latins
), pairs AS (
SELECT accent, latin FROM lookups,
UNNEST(SPLIT(accents)) AS accent WITH OFFSET AS p1,
UNNEST(SPLIT(latins)) AS latin WITH OFFSET AS p2
WHERE p1 = p2
), map AS (
SELECT latin, CONCAT('[', STRING_AGG(accent, ''), ']') AS accents
FROM pairs
GROUP BY latin
)
SELECT CONCAT('(?i:', STRING_AGG(IFNULL(accents, char), ''), ')')
FROM UNNEST(SPLIT(word, '')) char
LEFT JOIN map
ON char = latin
));
WITH yourTable AS (
SELECT 'Séries' AS word UNION ALL SELECT 'Series' UNION ALL
SELECT 'brasília' UNION ALL SELECT 'Niño' UNION ALL SELECT 'aperçu'
), inputs AS (
SELECT 'series' AS input UNION ALL SELECT 'Brasilia' UNION ALL
SELECT 'nino' UNION ALL SELECT 'apercu'
)
SELECT input, word AS found_word
FROM yourTable CROSS JOIN inputs
WHERE REGEXP_CONTAINS(word, latin2accents(input)) = TRUE
ORDER BY input, word
输出是(我认为你想要的)
input found_word
----- ----------
Brasilia brasília
apercu aperçu
nino Niño
series Series
series Séries
答案 1 :(得分:1)
使用Java Collator
(例如参见this answer),您可以采用一种可能更简单的方法:
scala> val c = java.text.Collator.getInstance()
c: java.text.Collator = java.text.RuleBasedCollator@289747d6
scala> c.setStrength(Collator.PRIMARY)
scala> c.equals("é","E")
res24: Boolean = true
scala> c.setStrength(Collator.SECONDARY)
scala> c.equals("é","E")
res26: Boolean = false
这要考虑到您的语言环境,因为构成“基本”(等效)字符的规则在每种语言中都会有所不同。