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PM37603: docs: Regular expressions example program error

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APAR status

  • Closed as documentation error.

Error description

  • Problem
    using the Regular expressions example program from the DXL
    reference manual throws an error
    
    To Reproduce
    run the DXL from the example in your DOORS client:
    
    // regular expression DXL example
    /*
      examples of regular expression DXL
    */
    Regexp line = regexp2 '.*'
    // matches any character except newline
    string txt1 = 'line 1\nline 2\nline 3\n'
    // 3 line string
    while (!null txt1 ?? line txt1) {
        print txt1[match 0] '\n'
        // match 0 is whole of match
        txt1 = txt1[end 0 + 2:]   // move past newline
    }
    // The following regular expression detects and decomposes URLs
    Regexp URL = regexp2 //'(HTTP|http|ftp|FTP|file|FILE)://([^
    \\),;?\']*)'
    string txt3 = 'The ABC URL is http://www.abcinc.com, and may
    be...'
    if (URL txt3) {
      print txt3[match 0] '\n'   // whole match
      print txt3[match 1] '\n'     // first bracketed section
      print txt3[match 2] '\n'     // second.
      print start 1              // position 15 in txt3 (from 0)
      print end 1                  //          18
      print start 2                //          22
      print end 2                  //          34
    }
    
    Expected Results
    it should print out:
    line 1
    line 2
    line 3
    http://www.abcinc.com
    http
    www.abcinc.com
    15
    18
    22
    35
    
    
    Actual Results
    instead it errors out with the following:
    -E- DXL: ?Line:15? incorrect arguments for (=)
    -I- DXL: All done. Errors reported: 1. Warnings reported: 0.
    
    
    Possible Workarounds
    change this line:
    Regexp URL = regexp2 //'(HTTP|http|ftp|FTP|file|FILE)://([^
    \\),;?\']*)'
    
    to:
    Regexp URL = regexp2 '(HTTP|http|ftp|FTP|file|FILE)://([^
    \\),;?\']*)'
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Example given for Regular expression usage in the DXL manual
    is incorrect.
    

Problem conclusion

  • Example given for Regular expression usage in the DXL manual
    needs corrected
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM37603

  • Reported component name

    TLOGIC DOORS

  • Reported component ID

    5724V61DR

  • Reported release

    930

  • Status

    CLOSED DOC

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-04-21

  • Closed date

    2011-06-20

  • Last modified date

    2011-06-20

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

Applicable component levels



Document information

More support for: Rational DOORS

Software version: 9.3

Reference #: PM37603

Modified date: 20 June 2011