如何查找在保存的 html 文件中找到字符串的次数？答案

【问题标题】：How to find the number of times a string is found in a saved html file?如何查找在保存的 html 文件中找到字符串的次数？
【发布时间】：2020-04-24 15:40:53
【问题描述】：

我有一个保存的 html 文件，我试图从中查找特定字符串的找到次数。例如：

string= 'Beautiful days'
text = "those beautiful days were unforgettable. I wish every day was a beautiful day"

预期输出 = 2（美好的日子，美好的日子”

尝试以下方法：我尝试使用 spacy 但做不到。谁能告诉我这个的逻辑？

【问题讨论】：

beautiful days 和 beautiful day 不一样。
@DirtyBit 我正在尝试找到最接近和完全匹配
酷。在这种情况下你可以使用lower()。

标签： python string nlp spacy

【解决方案1】：

您可以使用词干分析器。这可能有点矫枉过正，但它也会找到最接近的词

import nltk
nltk.download('punkt')

from nltk.stem import PorterStemmer 
from nltk.tokenize import word_tokenize 

ps = PorterStemmer() 

sentence = "those beautiful days were unforgettable. I wish every day was a beautiful day"
words = word_tokenize(sentence) 
sentence = ""
for w in words: 
    sentence += (ps.stem(w.lower()) + " ")
query = 'Beautiful days' 
words = word_tokenize(query) 
query = ""
for w in words: 
    query += (ps.stem(w.lower()) + " ")
print(sentence)
print(query)
print(sentence.count(query))

those beauti day were unforgett . i wish everi day wa a beauti day 
beauti day 
2

【讨论】：

【解决方案2】：

你也可以使用：

import re

with open("count_string_in_file.txt") as f:
    html = f.read()

to_match = "beautiful day"
matches = re.findall(to_match, html, re.IGNORECASE)
print(len(matches), matches)
# 2 ['beautiful day', 'beautiful day']

Demo

【讨论】：