Match exact phrase within a string in Python

Question

I\'m trying to determine whether a substring is in a string. The issue I\'m running into is that I don\'t want my function to return True if the substring is found within an

Answer 1

One can do this very literally with a loop

phrase = phrase.lower()
text = text.lower()

answer = False 
j = 0
for i in range(len(text)):
    if j == len(phrase):
        return text[i] == " "
    if phrase[j] == text[i]:
        answer = True
        j+=1
    else:
        j = 0 
        answer = False 
return answer

Or by splitting

phrase_words = phrase.lower().split()
text_words = text.lower().split()

return phrase_words in text_words

or using regular expressions

import re
pattern = re.compile("[^\w]" + text + ""[^\w]")
pattern.match(phrase.lower())

to say that we want no characters preceding or following our text, but whitespace is okay.