正则表达式匹配特定单词后跟另一个单词以及边界标识符

Question

我在Python中进行正则表达式匹配.我试图遵循一些组合,但没有工作.我是正则表达式的新手.我的问题是,我有一个字符串如下.

string = ''' World is moving towards a particular point'''

我想要一个解决方案来检查单词"moving"之后是否存在单词"towards",如果是,我想选择该行的其余部分(在'towards'之后),直到它以'.'结尾.或' - '.我是新手.请提供一些好的建议.

Answer 1

就像是

re.findall (r'(?<=moving towards )[^-.]*', string)
['a particular point']

• (?<=moving towards )看看断言背后.断言字符串前面有moving towards

• [^-.]*匹配除了-或之外的任何东西.

它是如何匹配的

World is moving towards a particular point
                        |
     (?<=moving towards ) #checks if this position is presceded by moving towards 
                          #yes, hence proceeds with the rest of the regex pattern

World is moving towards a particular point
                        |
                      [^-.]

World is moving towards a particular point
                         |
                       [^-.] 

# and so on


World is moving towards a particular point
                                         |
                                       [^-.]

正则表达式演示