正则表达式\b匹配单词边界，结果和我预期不同，帮看看下！

[JeanLove]

print re.match("\bThe\b","in The word").group()

我期待"\b"是用来“匹配任何单词边界”

为什么这个匹配没有返回任何结果呢？

[oyljerry]

re.search("\\bThe\\b","in The word")

[MaMMoN2017]

re.match(pattern, string, flags=0)¶ If zero or more characters at the beginning of string match the regular expression pattern, return a corresponding match object. Return None if the string does not match the pattern; note that this is different from a zero-length match. Note that even in MULTILINE mode, re.match() will only match at the beginning of the string and not at the beginning of each line. If you want to locate a match anywhere in string, use search() instead (see also search() vs. match()). match 用来比较pattern 和 string, 只会匹配字符串的起始部分, 你用错函数了.

[qq_41619756]

字符串前需要加r进行转意

[欢乐的小猪]

Python提供了基于正则表达式的两种不同的原始操作：re.match只在字符串的开头检查匹配，而re.search检查字符串中的任何匹配项。