parsing - ENBF to JavaCC difference between [] and {} -

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मेरे पास EBNF में निम्नलिखित 2 उत्पादन नियम हैं: 

  & lt; charliteral & gt; :: = '' '[& lt; प्रिंट करने योग्य & gt;]' ''   
 और  
  & lt; स्ट्रिंग लिटरल & gt; :: = '"' {& lt; प्रिंट करने योग्य & gt;} ''   
 दोनों के बीच अंतर क्या है? [] 1 या अधिक पुनरावृत्तियों का अर्थ है और {} 0 या अधिक पुनरावृत्तियों का अर्थ है?   
 
 
 ईबीएनएफ में,  [एक्स]  का मतलब 0 या 1  एक्स  और  {X}  से 0 या अधिक  X  का अर्थ है।  
 जावासीसी में,  [X]  व्याकरण निर्माण के लिए 0 या 1  एक्स  का अर्थ है; नियमित अभिव्यक्ति प्रस्तुतियों में, आपको  (X) का उपयोग करना चाहिए?  इसके बजाय जावा सी में 0 या अधिक  एक्स  को व्यक्त करने के लिए  (एक्स) * ।

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