Regex Bug???

Collapse
This topic is closed.
X
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Alphamacaroon
    #1

    Regex Bug???

    I am noticing some really strange behavior with Regex replacements and
    am wondering if anyone can help me make any sense of it.

    Let's say we have a string "Price=#InsertP rice#" and we want to
    replace "#InsertPri ce# with one or more "$" symbols to denote the
    price level.

    Now, here's what I'm seeing when I try the following replacement
    strings:

    Replacement String Output
    ---------------------------------------------------------------------------------------
    "$" - "Price=
    $"
    "$$" - "Price=
    $"
    "$$$" - "Price=$
    $"

    What appears to be happening is that it's truncating the first "$"
    when the output string is being built.

    My first thought is that this might be because the "$" symbol is a
    special character used for substitutions and I needed to escape it.
    But when I try to escape it, it doesn't work either. I get:

    @"\$\$" - "Price=\$\
    $"

    At this point I have no idea what is going on here and all I can think
    of is that this must be a bug. Any ideas?
    Tags: None
    • =?ISO-8859-1?Q?Arne_Vajh=F8j?=
      #2
      Re: Regex Bug???

      Alphamacaroon wrote:
      I am noticing some really strange behavior with Regex replacements and
      am wondering if anyone can help me make any sense of it.
      >
      Let's say we have a string "Price=#InsertP rice#" and we want to
      replace "#InsertPri ce# with one or more "$" symbols to denote the
      price level.
      >
      Now, here's what I'm seeing when I try the following replacement
      strings:
      >
      Replacement String Output
      ---------------------------------------------------------------------------------------
      "$" - "Price=
      $"
      May we see a code snippet illustrating the problem ?

      Arne

        Comment

        • Alain Boss
          #3
          Re: Regex Bug???

          Alphamacaroon schrieb:
          I am noticing some really strange behavior with Regex replacements and
          am wondering if anyone can help me make any sense of it.
          >
          Let's say we have a string "Price=#InsertP rice#" and we want to
          replace "#InsertPri ce# with one or more "$" symbols to denote the
          price level.
          >
          Now, here's what I'm seeing when I try the following replacement
          strings:
          >
          Replacement String Output
          ---------------------------------------------------------------------------------------
          "$" - "Price=
          $"
          "$$" - "Price=
          $"
          "$$$" - "Price=$
          $"
          >
          What appears to be happening is that it's truncating the first "$"
          when the output string is being built.
          >
          My first thought is that this might be because the "$" symbol is a
          special character used for substitutions and I needed to escape it.
          But when I try to escape it, it doesn't work either. I get:
          >
          @"\$\$" - "Price=\$\
          $"
          >
          At this point I have no idea what is going on here and all I can think
          of is that this must be a bug. Any ideas?
          your problem might be that '/' is also a special c# character. please
          post some code, as arne suggested, or try your regex using @"" for your
          regex-definition.

          alain

            Comment

            • Jesse Houwing
              #4
              Re: Regex Bug???

              Hello Alphamacaroon,
              I am noticing some really strange behavior with Regex replacements and
              am wondering if anyone can help me make any sense of it.
              >
              Let's say we have a string "Price=#InsertP rice#" and we want to
              replace "#InsertPri ce# with one or more "$" symbols to denote the
              price level.
              >
              Now, here's what I'm seeing when I try the following replacement
              strings:
              >
              Replacement String Output
              ----------------------------------------------------------------------
              -----------------
              "$" - "Price=
              $"
              "$$" - "Price=
              $"
              "$$$" - "Price=$
              $"
              What appears to be happening is that it's truncating the first "$"
              when the output string is being built.
              >
              My first thought is that this might be because the "$" symbol is a
              special character used for substitutions and I needed to escape it.
              But when I try to escape it, it doesn't work either. I get:
              >
              @"\$\$" ->
              "Price=\$\ $"
              >
              At this point I have no idea what is going on here and all I can think
              of is that this must be a bug. Any ideas?

              $ is indeed special in a replaceemnt string. And you can escape it (as you've
              already done in your second example) by doubling it up, like this: $$.

              --
              Jesse Houwing
              jesse.houwing at sogeti.nl


                Comment

                • Alphamacaroon
                  #5
                  Re: Regex Bug???

                  On Apr 29, 11:45 am, Jesse Houwing <jesse.houw...@ newsgroup.nospa m>
                  wrote:
                  Hello Alphamacaroon,
                  >
                  >
                  >
                  I am noticing some really strange behavior with Regex replacements and
                  am wondering if anyone can help me make any sense of it.
                  >
                  Let's say we have a string "Price=#InsertP rice#" and we want to
                  replace "#InsertPri ce# with one or more "$" symbols to denote the
                  price level.
                  >
                  Now, here's what I'm seeing when I try the following replacement
                  strings:
                  >
                  Replacement String Output
                  ----------------------------------------------------------------------
                  -----------------
                  "$" - "Price=
                  $"
                  "$$" - "Price=
                  $"
                  "$$$" - "Price=$
                  $"
                  What appears to be happening is that it's truncating the first "$"
                  when the output string is being built.
                  >
                  My first thought is that this might be because the "$" symbol is a
                  special character used for substitutions and I needed to escape it.
                  But when I try to escape it, it doesn't work either. I get:
                  >
                  @"\$\$" ->
                  "Price=\$\ $"
                  >
                  At this point I have no idea what is going on here and all I can think
                  of is that this must be a bug. Any ideas?
                  >
                  $ is indeed special in a replaceemnt string. And you can escape it (as you've
                  already done in your second example) by doubling it up, like this: $$.
                  >
                  --
                  Jesse Houwing
                  jesse.houwing at sogeti.nl
                  Ahhh. Makes sense. So unlike RegEx Pattern strings where the escape
                  char is '\', the escape char for the replacement string is '$' itself.
                  I'll give it a try, but I suspect that will fix it. Thanks!

                  BTW: Is this documented anywhere?

                    Comment

                    Previous template Next
                    Working...