Ah. Now I understand. You have a literal "\n", not a newline in your data, but you don't want to capture that. The easiest way is to restrict the character class to not include the backslash:

for (<DATA>) {
    print "Matched: $1\n"
        if /DIP\s+\S+\s+([^\\\s]+).*?\\n/;
    
};
__DATA__
*** ALARM 009 A2/APT \"KEN5-132/019/00\" 100831   1511      \nSWITCHIN
+G NETWORK TERMINAL FAULT\n\nSNT                TCASE  STATE    FCODE 
+SUBSNT  INFO        DIP amad theoneiwant\n RTDMA-63           4      
+BLOC     38\n\nEXTERNAL EQUIPMENT FAILURE\n\nEXTP                MG\n
+2-2-010109          MEAPH\nEND
*** ALARM 009 A2/APT \"KEN5-132/019/00\" 100831   1511      \nSWITCHIN
+G NETWORK TERMINAL FAULT\n\nSNT                TCASE  STATE    FCODE 
+SUBSNT  INFO        DIP amad theoneiwant      \n RTDMA-63           4
+      BLOC     38\n\nEXTERNAL EQUIPMENT FAILURE\n\nEXTP              
+  MG\n2-2-010109          MEAPH\nEND
*** ALARM 009 A2/APT \"KEN5-132/019/00\" 100831   1511      \nSWITCHIN
+G NETWORK TERMINAL FAULT\n\nSNT                TCASE  STATE    FCODE 
+SUBSNT  INFO        DIP amad theoneiwant hello world \n RTDMA-63     
+      4      BLOC     38\n\nEXTERNAL EQUIPMENT FAILURE\n\nEXTP       
+         MG\n2-2-010109          MEAPH\nEND
*** ALARM 009 A2/APT \"KEN5-132/019/00\" 100831   1511      \nSWITCHIN
+G NETWORK TERMINAL FAULT\n\nSNT                TCASE  STATE    FCODE 
+SUBSNT  INFO        DIP amad theoneiwant\n RTDMA-63           4      
+BLOC     38\n\nEXTERNAL EQUIPMENT FAILURE\n\nEXTP                MG\n
+2-2-010109          MEAPH\nEND

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The character class \S will not match any whitespace, but the character sequence "\n" (that is, backslash, followed by "n") is not whitespace.

In reply to Re^3: Regex: Ignore \n in \S by Corion
in thread Regex: Ignore \n in \S by manav_gupta

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