如何使用python查找文本文件中的特定单词

Question

我有一个包含我们的文本文件，uss，usr想读取特定单词和单词“ uss”的长度如何使用python进行读取

Answer 1

import re
def findwords(text, length):
    return re.findall(r"\b\w{{{0}}}\b".format(length), text)

\\b is a word boundary that ensures only entire words are matched.

r"\\w{{{0}}}".format(3) results in r"\\w{3}" . The double braces are necessary for escaping.

\\w matches alphanumeric characters; if you want to avoid matching digits or the underscore with it, use [^\\W\\d_] in its place:

def findwords(text, length):
    return re.findall(r"\b[^\W\d_]{{{0}}}\b".format(length), text)

Answer 2

Why not use regex ?

import re
help(re)

http://docs.python.org/library/re.html

For your trouble, you can use following regex :
- r'\\w{3}' : match 3 characters (no digit)

You can add \\s before or after for match space or tabs.