8 Comments on “Which two AS paths match?”

1. jslaven says:

   October 24, 2014 at 7:11 pm

   If the regular expression is: .* 14203+ (21870|10458) and there’s a pipe “|” between 21870 and 10458, then answer B and D.

   
   
   
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   1. jslaven says:

      November 3, 2014 at 8:50 am

      Correction: answer b and c

      
      
      
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2. Dylan says:

   November 24, 2014 at 6:20 pm

   I also agree. B and C are correct

   Definitions
   . ==> One instance of any character except the space. For example, .456 matches 1456 or 6456.
   + ==> One or more instances of the immediately preceding term. For example, tre+ matches messages with tree or tread but not trough.
   * ==> Zero or more instances of the immediately preceding term. For example, 234* matches 2345698 or 2347985

   .*14203+ (21870 | 10458)

   (.) Can begin with one instance of any character except space. Meaning it can begin with anything.
   The Any Characters we chose in (*) is preceeding (*)

   What determines the answer are these
   Must have one or more instances of 14203 (Makes answer A wrong)
   Then can have either 21870 or 10458 at the end (Makes answer D wrong)

   
   
   
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3. miro312 says:

   February 5, 2015 at 7:45 pm

   It should be: .* 14203+ (21870|10458)$ and therefore B and C are correct.

   
   
   
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4. jkhan says:

   March 6, 2015 at 7:08 pm

   with all the possibilities mentioned I tried but all fails. no match .http://www.regexplanet.com/advanced/java/index.html

   
   
   
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5. testking502 says:

   July 22, 2015 at 7:27 pm

   D is also incorrect as it doesn’t end with either 21870 or 10458. Only C is correct and matches.

   
   
   
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6. testking502 says:

   July 22, 2015 at 7:29 pm

   I’m smoking crack.

   B is the only correct answer.

   C ends with both 21870 and 10458. The “()” is an OR operator. It can’t match both.

   
   
   
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7. testokhan says:

   September 18, 2015 at 8:31 pm

   by playing left and right the only option gets the two results is:

   .* 14203+ (21870|10458)$

   selecting three options:
   1.Perform multiline matching

   2. Perform a global match (don’t stop at first match)

   3. DOT ALL. The dot (.) metacharacter matches any character INCLUDING line breaks.

   answer A & B

   A: 27522 2187010458
   B: 27522 14203 14203 14203 21870

   http://www.freeformatter.com/regex-tester.html

   
   
   
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