[英]How do I match exact strings from a list to a larger string taking white spaces into account?
I have a large list of strings and I want to check whether a string occurs in a larger string.我有一个很大的字符串列表,我想检查一个字符串是否出现在更大的字符串中。 The list contains of strings of one word and also strings of multiple words.该列表包含一个单词的字符串和多个单词的字符串。 To do so I have written the following code:为此,我编写了以下代码:
example_list = ['pain', 'chestpain', 'headache', 'sickness', 'morning sickness']
example_text = "The patient has kneepain as wel as a headache"
emptylist = []
for i in example_text:
res = [ele for ele in example_list if(ele in i)]
emptylist.append(res)
However the problem is here is 'pain' is also added to emptylist which it should not as I only want something from the example_list to be added if exactly matches the text.然而,这里的问题是“痛苦”也被添加到空列表中,它不应该,因为我只希望在与文本完全匹配的情况下添加 example_list 中的某些内容。 I also tried using sets:我也尝试使用集合:
word_set = set(example_list)
phrase_set = set(example_text.split())
word_set.intersection(phrase_set)
This however chops op 'morning sickness' into 'morning' and 'sickness'.然而,这将 op 'morning disease' 分为'morning' 和 'sickness'。 Does anyone know what is the correct way to tackle this problem?有谁知道解决这个问题的正确方法是什么?
Using PyParsing:使用 PyParsing:
import pyparsing as pp
example_list = ['pain', 'chestpain', 'headache', 'sickness', 'morning sickness']
example_text = "The patient has kneepain as wel as a headache morning sickness"
list_of_matches = []
for word in example_list:
rule = pp.OneOrMore(pp.Keyword(word))
for t, s, e in rule.scanString(example_text):
if t:
list_of_matches.append(t[0])
print(list_of_matches)
Which yields:其中产生:
['headache', 'sickness', 'morning sickness']
Nice examples have already been provided in this post by members.成员在这篇文章中已经提供了很好的例子。
I made the matching_text a little more challenging where the pain occurred more than once.我使matching_text更具挑战性,因为它不止一次地出现了疼痛。 I also aimed for a little more information about where the match location starts.我还希望了解更多有关比赛位置开始位置的信息。 I ended up with the following code.我最终得到了以下代码。
I worked on the following sentence.我研究了以下句子。
"The patient has not only kneepain but headache and arm pain, stomach pain and sickness"
import re
from collections import defaultdict
example_list = ['pain', 'chestpain', 'headache', 'sickness', 'morning sickness']
example_text = "The patient has not only kneepain but headache and arm pain, stomach pain and sickness"
TruthFalseDict = defaultdict(list)
for i in example_list:
MatchedTruths = re.finditer(r'\b%s\b'%i, example_text)
if MatchedTruths:
for j in MatchedTruths:
TruthFalseDict[i].append(j.start())
print(dict(TruthFalseDict))
The above gives me the following output.以上给了我以下输出。
{'pain': [55, 69], 'headache': [38], 'sickness': [78]}
You should be able to use a regex using word boundaries您应该能够使用使用字边界的正则表达式
>>> import re
>>> [word for word in example_list if re.search(r'\b{}\b'.format(word), example_text)]
['headache']
This will not match 'pain'
in 'kneepain'
since that does not begin with a word boundary.这将不匹配'pain'
'kneepain'
'pain'
中的'kneepain'
因为它不以单词边界开头。 But it would properly match substrings that contained whitespace.但它会正确匹配包含空格的子字符串。
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