Question

我有样本查询

 select c.name , c.id from company c where
 c.name like 'Hoder%' and c.name like 'Stock%' amd c.name like 'Colour%'
 and c.name like '%Delete' and c.name like '%Regular' and c.name like '%Filler'
 and c.name like '%wipe%' and c.name like '%palce%' and c.name like '%double%',
 and c.name in ('IT', 'Wall', SpyCorp', 'Signal')

从上面的查询我知道单词列表，我正在用正则表达式实现查询上面的表格我写了一个正则表达式

#for exact matching words 
pnexact = ['IT', 'Wall', SpyCorp', 'Signal']
regexact = [re.compile(r"\b%s\b" % word.lower() ) for word in pnexact]#list of regex object
#for words which are contain in the string eg: '%wipe%' ...
pncontains = ['wipe','palce','double',]
pnregexobj_contains = re.compile(r"%s" % '|'.join(pncontains)) #single regex object

上面的正则表达式工作正常，但是我无法编写正则表达式来处理单词'Hoder%','Stock%','Color%'的情况案件%Delete','%Regular','%Filler' 请建议我正则表达式将处理上述两种情况

感谢

Answer 1

将%替换为.*。例如，要匹配%Delete之类的单词，请使用：

>>> import re
>>> re.match(r'\b.*Delete\b', 'NoDelete')
<_sre.SRE_Match object at 0x100456100>
>>> _.group()
'NoDelete'
>>> re.match(r'\b.*Delete\b', 'Mismatch')

Answer 2

import re
m = lambda regex: re.match(regex, name)

m(r'.*Delete$') # name like %Delete
m(r'Delete')    # name like Delete%
m(r'.*Delete')  # name like %Delete%

要了解name是否是其中一个词：

pnexact = ['IT', 'Wall', 'SpyCorp', 'Signal'] # use `set()` if the list is long
name in pnexact # name in ('IT', 'Wall', 'SpyCorp', 'Signal')

或者如果您想使用正则表达式：

m(r"^(?:%s)$" % "|".join(map(re.escape, pnexact)))

Answer 3

这部分：WHERE c.name like 'Hoder%' and c.name like 'Stock%'

相当于：WHERE False

列（如c.name）无法同时从Hoder和Stock开始。

您可能打算使用OR而不是AND。

在查询中写入等效于like语句的正则表达式

3 个答案: