detecting '\' in a string

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  • Stephen
    #1

    detecting '\' in a string

    Hi,

    I need to detect the presence of a backslash character in a string and
    escape that character using the replace function. I seem to be able to do
    this with any character except the backslash character. The replace
    function is ignoring the presence of the baclslash. The simple code I am
    using is below:

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

    <html>
    <head>
    <title>Untitled </title>
    <script language="JavaS cript1.2">
    function FileName(){
    filenameTest = 'hello \ goodbye'
    alert(filenameT est.replace('\\ ','\\\\'))
    }
    </script>
    </head>
    <body onload="FileNam e()">
    </body>
    </html>

    Like I say, if I try to replace any other character it is fine but it seems
    not to be able to detect the backslash in the variable filenameTest

    Any ideas?

    Thanks,
    Stephen
    Tags: None
    • Christopher J. Hahn
      #2
      Re: detecting '\' in a string

      Stephen wrote:[color=blue]
      > Hi,
      >
      > I need to detect the presence of a backslash character in a string and
      > escape that character using the replace function. I seem to be able to do
      > this with any character except the backslash character. The replace
      > function is ignoring the presence of the baclslash. The simple code I am
      > using is below:
      >
      > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
      >
      > <html>
      > <head>
      > <title>Untitled </title>
      > <script language="JavaS cript1.2">
      > function FileName(){
      > filenameTest = 'hello \ goodbye'
      > alert(filenameT est.replace('\\ ','\\\\'))
      > }
      > </script>
      > </head>
      > <body onload="FileNam e()">
      > </body>
      > </html>
      >
      > Like I say, if I try to replace any other character it is fine but it seems
      > not to be able to detect the backslash in the variable filenameTest
      >
      > Any ideas?
      >
      > Thanks,
      > Stephen[/color]

      That's because there's no backslash in it. Your replace is fine, but
      your test case is what's flawed: by not escaping the backslash, you've
      escaped the space that comes after it. Try this:

      filenameTest = 'hello \\ goodbye'

      Ironic, isn't it?

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