我试图匹配包含N次字母的单词(使用MATLAB的正则表达式),并且我并不是说只找到重复的字母,我可以这样做:
\w*(\w)\1\w*
一个简单的例子是找到以下正则表达式:匹配包含字母a的3倍的单词.如果给定的字符串是:
喂b 一个 Ñ 一个 Ñ 一个阿拉巴马俄克拉荷马Ç 一个 Ñ AA Ñ
然后匹配的单词应该是:
香蕉和迦南.所有其他包含更少或更多a.
感谢任何帮助谢谢.
I am looking for MySQL equivalent or equivalents for the following query:
(select course_id
from section
where semester = 'Fall' and year= 2009)
except
(select course_id
from section
where semester = 'Spring' and year= 2010);
where the section table is:
+-----------+--------+----------+------+----------+-------------+--------------+
| course_id | sec_id | semester | year | building | room_number | time_slot_id |
+-----------+--------+----------+------+----------+-------------+--------------+
| BIO-101 | 1 | Summer | 2009 | Painter | 514 | B |
| BIO-301 | 1 | Summer | 2010 …