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SKILL regex pattern matching

anushar

Hi,

I have a string "[@global_vddi:%:vddi!]" which I need to process to remove "@[]" chars. The desired result is "global_vddi:%:vddi!". I tried the following in CIW

netExpr = "[@global_vddi:%:vddi!]"
rexCompile("\\([a-zA-Z0-9_:!%]+\\)")
t
rexExecute(netExpr)
t
rexSubstitute( "\\0" )
"global_vddi:%:vddi!"

and I achieved the desired value. I added the same code to my script but it didn't work. In my script rexExecute returns 't' but rexSubstitute returns 'nil' 

Here is the snippet from my script

netExpr = dbGetTermNetExpr(term)
if(netExpr then
rexCompile("\\([a-zA-Z0-9_:!%]+\\)")
rexExecute(netExpr)
netExpr1 = rexSubstitute( "\\0" )

...

. ..)  and trace log showing the variable values as the code executes

stopped before evaluating dbGetTermNetExpr(term)
after evaluating dbGetTermNetExpr(term)==> "[@global_vddi:%:vddi!]"
after evaluating (netExpr = dbGetTermNetExpr(term))==> "[@global_vddi:%:vddi!]"
stopped before evaluating if(netExpr then rexCompile("\\([a-zA-Z0-9_:!%]+\\)") rexExecute(netExpr) (netExpr1 = rexSubstitute("\\0")) ... )
stopped before evaluating rexCompile("\\([a-zA-Z0-9_:!%]+\\)")
after evaluating rexCompile("\\([a-zA-Z0-9_:!%]+\\)")==> t
stopped before evaluating rexExecute(netExpr)
after evaluating rexExecute(netExpr)==> t
stopped before evaluating (netExpr1 = rexSubstitute("\\0"))
stopped before evaluating rexSubstitute("\\0")
after evaluating rexSubstitute("\\0")==> nil
|[2]netExpr1 set to nil, was nil

Any help or suggestions as to why the code executes differently in CIW and when called from a SKILL script file will be much appreciated.

I also tried a different approach using rexReplace instead of rexSubstitute but couldn't get the regex pattern correct. The code I tried in CIW using rexReplace is as follows

a = "[@global_vddi:%:vddi!]"
"[@global_vddi:%:vddi!]"
rexCompile("\\([@\\[\\]]*\\)")
t
rexReplace(a "" 0)
"global_vddi:%:vddi!]"

Only '@[' get replaced and ']' is still present. The regex pattern contains '\\]' to match the closing square bracket yet it is not replaced. Please let me know what I'm missing in these 2 scenarios.

Any help is much appreciated!!

Regards,

Confused SKILL user 

Parents

  • I wouldn't bother with a regex here if not really necessary (woukd be "^\\[@([^]]+)\\]$"),
    e.g. dbParseSigNetExpr is prob. easier to use, and there are also other options, but cannot post them; the forum gives me error, when I add them.

    Regards,

    str = "[@ABC:%:abc!]"
    ; regex
    reg = pcreCompile("^\\[@([^]]+)\\]$")

    ; advantage of regex is that it can test the format
    when(pcreExecute(reg str)
    ; the first capture is in \\1
    printf("regex : %s\n" pcreSubstitute(reg "\\1"))
    )


    ; also tests the format
    arr = dbParseSigNetExpr( str ) ; splits into '(@ ABC % abc!)

    ; compine to your liking
    printf("sigparse+print: %s:%%:%s\n" cadr(arr) cadddr(arr))
    printf("sigparse+build: %s\n" buildString(cdr(arr) ":"))

    ; split on unwanted chars
    printf("strparse : %s\n" car(parseString( str "[@]")))

    ; or just remove the envelop with substring

Reply

  • I wouldn't bother with a regex here if not really necessary (woukd be "^\\[@([^]]+)\\]$"),
    e.g. dbParseSigNetExpr is prob. easier to use, and there are also other options, but cannot post them; the forum gives me error, when I add them.

    Regards,

    str = "[@ABC:%:abc!]"
    ; regex
    reg = pcreCompile("^\\[@([^]]+)\\]$")

    ; advantage of regex is that it can test the format
    when(pcreExecute(reg str)
    ; the first capture is in \\1
    printf("regex : %s\n" pcreSubstitute(reg "\\1"))
    )


    ; also tests the format
    arr = dbParseSigNetExpr( str ) ; splits into '(@ ABC % abc!)

    ; compine to your liking
    printf("sigparse+print: %s:%%:%s\n" cadr(arr) cadddr(arr))
    printf("sigparse+build: %s\n" buildString(cdr(arr) ":"))

    ; split on unwanted chars
    printf("strparse : %s\n" car(parseString( str "[@]")))

    ; or just remove the envelop with substring

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