Topic: ? about this code

[jlogan02]

Pulled this off the interwebs on cadtutor https://www.cadtutor.net/forum/topic/37911-layer-prefixes/ written by pBe.

I've tested this on a group of layers where I want to change just the prefix. It appears to work but my concern is my existing layer names have the same 4 letters in the body of the layer name. Is this bullet proof enough to not change that body text?

TBLK_TBLK_####

Result should be

TTBK_TBLK_####

Code - Auto/Visual Lisp: [Select]

1. (defun c:FixPrefix  ( / OldPrefix NewPrefix ln)
2.      (vl-load-com)
3.      (setq OldPrefix "TBLK"
4.            NewPrefix "TTBK")
5.      (vlax-for
6.             layer
7.             (vla-get-layers
8.                   (vla-get-ActiveDocument (vlax-get-acad-object)))
9.            (if (wcmatch
10.                      (setq ln (vla-get-name layer))
11.                      (strcat OldPrefix "*"))
12.                  (vla-put-name
13.                        layer
14.                        (vl-string-subst NewPrefix OldPrefix ln))))
15.      )

I knowwww...why did you name them that way in the first place!?!?!?

[mhupp]

http://docs.autodesk.com/ACD/2014/ENU/index.html?url=files/GUID-D8EE91DC-D4DB-43E0-9AFE-5FA166C0896D.htm,topicNumber=d30e640068

(vl-string-subst "Obi-wan" "Ben" "Ben Kenobi Ben")
"Obi-wan Kenobi Ben"
Note that there are two occurrences of “Ben” in the string that was searched, but vl-string-subst replaces only the first occurrence.

formatted the code to look nicer

Code - Auto/Visual Lisp: [Select]

1. (defun c:FixPrefix (/ OldPrefix NewPrefix ln)
2.   (vl-load-com)
3.   (setq OldPrefix "TBLK"
4.         NewPrefix "TTBK"
5.   )
6.   (vlax-for layer (vla-get-layers (vla-get-ActiveDocument (vlax-get-acad-object)))
7.     (if (wcmatch (setq ln (vla-get-name layer)) (strcat OldPrefix "*"))
8.       (vla-put-name layer (vl-string-subst NewPrefix OldPrefix ln))
9.     )
10.   )
11. )

[jlogan02]

Roger that! Thanks mhupp