正则表达式-排除单词，但带有通配符

Question

一个表达式可能无法实现，但是可以了。

txt = 'check from HERE and i need RED but not BLUE'

对于上面的文本，我需要一个表达式，如果“ RED”出现在“ HERE”之后任何地方，但是“ BLUE”没有出现在此处任何地方，则该表达式将匹配。 / p>

Answer 1

对于后代：

没有正则表达式

txt = 'check from HERE and i need RED but not BLUE'
after_here = txt.split('HERE', 1)[1]
result = red in after_here and blue not in after_here

正则表达式

^.*HERE(?!.*BLUE.*).*RED.*$
#   ^ look after 'HERE'
#           ^ negative lookahead in everything that comes after HEAD for BLUE
#                     ^ look for RED in everything that comes after HEAD

// see https://www.regular-expressions.info/lookaround2.html