Code Red > AutoLISP (Vanilla / Visual)

I'm not understanding what is going on here.

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Eddie D.:
I'm getting an unexpected result from vl-string-left-trim that I don't understand.


This works is as expected:
(vl-string-left-trim  "PREFIX: " "PREFIX: ABCDEF")
Result: "ABCDEF"


This result has me confused:
(vl-string-left-trim  "PREFIX: " "PREFIX: FEDCBA")
Result: "DCBA"


I get a similar unexpected result if the beginning of the expected return string begins with E, F, I, P, R, and X.
What am I missing here?

efernal:
Command: (vl-string-left-trim  "PREFIX: " "PREFIX: FEDCBA")
"DCBA"

same here...

efernal:
vl-string-trim


Removes the specified characters from the beginning and end of a string

(vl-string-trim char-set str)

Arguments

char-set

A string listing the characters to be removed.

str

The string to be trimmed of char-set.

Return Values

The value of str, after any characters have been trimmed.

Examples

_$ (vl-string-trim " \t\n" " \t\n STR \n\t ")

"STR"

_$ (vl-string-trim "this is junk" "this is junk Don't call this
junk! this is junk")

"Don't call this junk!"

_$ (vl-string-trim " " " Leave me alone ")

"Leave me alone"

MP:
To add to what efernal posted ...

There's a number of ways to achieve (what I believe is) your intended result.

Observe what results from the following code snips which represent one of several ways:

(setq text "PREFIX: FEDCBA")

(if (< 0 (setq i (vl-string-mismatch "PREFIX: " text)))
    (substr text (1+ i))
    text
)

>>  "FEDCBA"

(setq text "prefix: fedcba")

(if (< 0 (setq i (vl-string-mismatch "PREFIX: " text)))
    (substr text (1+ i))
    text
)

>>  "prefix: fedcba"

(setq text "prefix: fedcba")

(if (< 0 (setq i (vl-string-mismatch "PREFIX: " (strcase text))))
    (substr text (1+ i))
    text
)

>>  "fedcba"

You may wish to review the documentation for these functions:

vl-string-trim:
http://help.autodesk.com/view/OARX/2019/ENU/?guid=GUID-FF1DA441-C9D8-4C99-BC6E-B2A72B562389

vl-string-subst:
http://help.autodesk.com/view/OARX/2019/ENU/?guid=GUID-D8EE91DC-D4DB-43E0-9AFE-5FA166C0896D

vl-string-mismatch:
http://help.autodesk.com/view/OARX/2019/ENU/?guid=GUID-D1EA6F47-146E-44BC-BBCA-40B7A874C0B8

etc.

Cheers.

Eddie D.:
Thanks for the replies, guys!


efernal, I get the same results with vl-string-trim.


MP, thanks for the examples, but I still don't understand why I get the results I'm getting with vl-string-trim/vl-string-left-trim.


Any ideas?

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