如何在Python中识别[[ ]]分隔符内单词单复数并生成对应列表

Got it, let's tackle this problem step by step. You already know how to extract the words inside [[ ]], but the missing piece is detecting that trailing s (for plural) right after the closing brackets. Here's a straightforward way to get both the word list and the plural marker list:

The key is updating our regex to capture two pieces of information: the word inside the brackets, and any optional s that immediately follows the closing ]].

1. Updated Regex Pattern #

Instead of just grabbing the inner word, we'll use a regex that captures two groups:

import re

# Your example text
input_text = "I have a red [[pen]], two blue [[pen]]s, two black [[pencil]]s and a green [[pencil]]"

# Capture (word inside [[ ]], optional trailing 's')
matches = re.findall(r'\[\[(.*?)\]\](s?)', input_text)

Let's break down the regex:

• \[\[(.*?)\]\]: Non-greedily captures the word inside the double brackets (so it stops at the first ]] instead of matching everything to the last one)
• (s?): Captures an optional s—this group will be either 's' (for plural) or an empty string (for singular)

2. Build the Two Lists #

Now we just loop through the matches to populate our lists:

word_list = []
plural_markers = []

for word, plural_suffix in matches:
    word_list.append(word)
    # Mark 1 if there's an 's' after the bracket, else 0
    plural_markers.append(1 if plural_suffix else 0)

# Let's check the output
print("Word List:", word_list)
print("Plural Markers:", plural_markers)

3. Verify the Result #

Running this code with your example text will produce exactly what you need:

Word List: ['pen', 'pen', 'pencil', 'pencil']
Plural Markers: [0, 1, 1, 0]

Quick Notes for Edge Cases #

• If there's whitespace between ]] and the s (like [[pen]] s), adjust the regex to r'\[\[(.*?)\]\]\s*(s?)' to allow optional spaces.
• For plural forms that don't use an s (like [[child]]ren), you'd need to expand the regex to match those suffixes, but this solution works perfectly for your given example.

内容的提问来源于stack exchange，提问作者Sali