Replace "+" with "\\+"

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  • bsonline
    New Member
    • Oct 2007
    • 21
    #1

    Replace "+" with "\\+"

    I want to replace + sign with 2 blackslash and 1 + sign (\\+)...
    when I use the replaceAll()...
    It throws a 500 status error like
    "java.util.rege x.PatternSyntax Exception: Dangling meta character '+' near index 0"

    wht s the solution or how can I replace ????
    Tags: None
    • r035198x
      MVP
      • Sep 2006
      • 13225
      #2
      Originally posted by bsonline
      I want to replace + sign with 2 blackslash and 1 + sign (\\+)...
      when I use the replaceAll()...
      It throws a 500 status error like
      "java.util.rege x.PatternSyntax Exception: Dangling meta character '+' near index 0"

      wht s the solution or how can I replace ????
      Bit of a nasty one that

      [CODE=java]replaceAll("\\+ ", "\\\\\\\\+" )[/CODE]

        Comment

        • dmjpro
          Top Contributor
          • Jan 2007
          • 2476
          #3
          Originally posted by r035198x
          Bit of a nasty one that

          [CODE=java]replaceAll("\\+ ", "\\\\\\\\+" )[/CODE]
          How does it work can you explain?

          Debasis Jana

            Comment

            • r035198x
              MVP
              • Sep 2006
              • 13225
              #4
              Originally posted by dmjpro
              How does it work can you explain?

              Debasis Jana
              Remember that + is a special character and \ is a special-special character.
              To match one \ you need four \

                Comment

                • BigDaddyLH
                  Recognized Expert Top Contributor
                  • Dec 2007
                  • 1216
                  #5
                  I'm not a big fan of regex (They're why I run screaming from PERL, but then isn't that known as a "write once" language because you don't ever want to read your own code?).

                  Anyhowdy, if you are just replacing text, there is no need to use String's replaceAll method which drags regex patterns into the fray. Use String's replace method which simply replaces all occurrences of the first string with the second.

                  [CODE=Java]result = s.replace("+", "\\\\+");[/CODE]

                  (You still need to escape \ as you always do in any string, of course.)

                  String.replace API

                    Comment

                    • r035198x
                      MVP
                      • Sep 2006
                      • 13225
                      #6
                      Originally posted by BigDaddyLH
                      I'm not a big fan of regex (They're why I run screaming from PERL, but then isn't that known as a "write once" language because you don't ever want to read your own code?).

                      Anyhowdy, if you are just replacing text, there is no need to use String's replaceAll method which drags regex patterns into the fray. Use String's replace method which simply replaces all occurrences of the first string with the second.

                      [CODE=Java]result = s.replace("+", "\\\\+");[/CODE]

                      (You still need to escape \ as you always do in any string, of course.)

                      String.replace API
                      Why do all mathematicians seem to have some sort of history with Perl ...

                        Comment

                        • BigDaddyLH
                          Recognized Expert Top Contributor
                          • Dec 2007
                          • 1216
                          #7
                          Originally posted by r035198x
                          Why do all mathematicians seem to have some sort of history with Perl ...
                          Maybe it's being relegated to linux/UNIX machines where it's more likely you'll bump into it. That's what happened to me.

                            Comment

                            • JosAH
                              Recognized Expert MVP
                              • Mar 2007
                              • 11453
                              #8
                              Originally posted by BigDaddyLH
                              Maybe it's being relegated to linux/UNIX machines where it's more likely you'll bump into it. That's what happened to me.
                              Until now I managed to stay as far away as possible from Larry Wall's miscarriage.
                              I only trust that Perl as far as i can throw a rock at it.

                              kind regards,

                              Jos

                                Comment

                                • BigDaddyLH
                                  Recognized Expert Top Contributor
                                  • Dec 2007
                                  • 1216
                                  #9
                                  Originally posted by JosAH
                                  Until now I managed to stay as far away as possible from Larry Wall's miscarriage.
                                  I only trust that Perl as far as i can throw a rock at it.

                                  kind regards,

                                  Jos
                                  I'm scared to look at the Perl forum to see what they're writing about us!

                                    Comment

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