python - Regex that matches a word bound by start and end of a string or non-word characters -

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मेरा पहला प्रयास है: 

  [\ ए \ बी] + (शब्द) [ \ Z \ b] +   
 लेकिन किसी कारण से यह काम नहीं कर रहा है। पायथन / पर्ल रीजजेक्स का उपयोग करके।  
 रीजक्स को ऐसे स्ट्रिंग में एक शब्द लेना चाहिए:  
 , शब्द शब्द,, शब्द, शब्द    
 
 
 शून्य-चौड़ाई वाले एन्कर्स जैसे  \ A  और  \ b  नहीं कर सकते चरित्र वर्गों के भीतर इस्तेमाल किया जा सकता है, न ही उनमें से एक से अधिक एक दूसरे के आस-पास हो सकते हैं, इसलिए  +  अर्थहीन है।  
 हालांकि,  \ b  पहले से ही स्ट्रिंग के प्रारंभ या अंत में सीमा से मेल खाएगा, इसलिए यह कार्य करना चाहिए:  
  \ b ( शब्द) \ b

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