only between bn and en.

python

from langdetect import detect_langs
from collections import defaultdict

def split_english_bangla(mixed_string):
    # To hold the detected languages and their corresponding text parts
    language_dict = defaultdict(str)
    
    # Split the string into words (or tokens)
    words = mixed_string.split()
    
    # Detect language for each word
    for word in words:
        try:
            # Detect the language and confidence
            detected_lang = detect_langs(word)[0]  # The most confident language
            lang = detected_lang.lang
            
            # Only keep English ('en') and Bangla ('bn')
            if lang == 'bn':
                language_dict[lang] += word + " "
            else:
                language_dict['en'] += word + " "
        except:
            # In case language detection fails, mark the word as 'unknown'
            language_dict['unknown'] += word + " "
    
    # Return the dictionary of languages and their corresponding text parts
    return {lang: text.strip() for lang, text in language_dict.items()}

# Example mixed string
mixed_string = "Hello world! এই পৃথিবী সুন্দর। How are you? তুমি কেমন আছো?"

# Split and detect languages
result = split_english_bangla(mixed_string)

print(result)