如何在Spacy，正则表达式python中将已识别的名词短语A修改为B或C->A修改为B或A修改为C

import spacy
import re

nlp = spacy.load('en_core_web_sm')

def modify_noun_phrase(text, phrase_a, phrase_b, phrase_c):
    doc = nlp(text)
    modified_text = text
    for token in doc:
        if token.text == phrase_a:
            modified_text = re.sub(r'\b%s\b' % phrase_a, phrase_b, modified_text)
        elif token.text == phrase_b:
            modified_text = re.sub(r'\b%s\b' % phrase_b, phrase_c, modified_text)
    return modified_text

text = "I want to modify the recognized noun phrase A to B or C."
phrase_a = "A"
phrase_b = "B"
phrase_c = "C"
modified_text = modify_noun_phrase(text, phrase_a, phrase_b, phrase_c)
print(modified_text)

I want to modify the recognized noun phrase B to B or C.