regex - HOW to use vim to find string with underscore -

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मैं 

 : s / IP_HD_LEN / IP_HDR_LEN  कोड>  
 लेकिन मुझे मिला  
  E486: पैटर्न नहीं मिला: IP_HD_LEN   
 इसमें क्या गलत है? < / P>  
 
 
 :% s / IP_HD_LEN / IP_HDR_LEN / जी  होगा कि यह कैसे करना है ।  
 यह कहता है कि पूरे दस्तावेज़ को खोजें और प्रतिस्थापन करें।  
 नीचे दिए गए टिप्पणियों में @ken द्वारा एक मान्य बिंदु। कमांड पर  / g  को जोड़कर, आप आईपी_एचडी_एलईएन के  प्रत्येक उदाहरण  पर यह प्रतिस्थापन ऑपरेशन कर रहे हैं। यदि आप केवल पहले उदाहरण को बदलना चाहते हैं, तो आप इसे छोड़ देंगे और इसके साथ समाप्त होंगे: :% s / IP_HD_LEN / IP_HDR_LEN

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