Function Entry: VL-STRING-POSITION

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Function Entry: VL-STRING-POSITION

Name

vl-string-position

Class

Visual LISP Function

Syntax

(vl-string-position char string [start-pos [from-end]])

Arguments and Values

char: integer character code
string: target string
start-pos: optional integer starting position; 0 if omitted
from-end: optional reverse-search flag

Description

Searches for a character within a string and returns its position.

Return Values

Index of the matching character, or nil.

Side Effects

None.

Compatibility

Character/index semantics are potentially version-sensitive in Unicode-aware hosts.

Availability

AutoCAD 2026: documented (per Autodesk reference page).
BricsCAD V26: presumed compatible (no contradicting page found).
Status: AutoCAD documented; BricsCAD presumed-both pending Phase 4 verification.

Source Notes

[vl-string-position (AutoLISP)](https://help.autodesk.com/cloudhelp/2023/ENU/AutoCAD-AutoLISP-Reference/files/GUID-2B0BF48B-FA26-431B-8EC3-DD0BD9F147A0.htm)
Status: documented.

Notes

Autodesk documents zero-based indexing: the first character is at position 0.
Autodesk documents that when from-end is T, the search proceeds backward from the end of the string toward start-pos.
Autodesk documents an AutoCAD 2021 change from ASCII character codes to Unicode character codes when LISPSYS selects the Unicode engine.