SUBST$

Create a new string by replacing a substring. * Syntax ```sbsyntax SUBST$ string$, startIndex% {, count% }, replacement$ OUT new$ ``` |* Input | Description | | `string$` | The string to modify. | | `startIndex%` | The index to start replacing characters at. | | `count%` | The number of characters to replace (optional.)\ If omitted, the rest of `string$` starting at `startIndex%` is replaced. | | `replacement$` | The string used to replace the substring. | |* Output | Description | | `new$` | The new string after the replacement is applied. | * Examples ```sb4 'replace "brown fox" with "red cow" PRINT SUBST$("The quick brown fox",10,"red cow") ``` ```sb4 'replace "brown" with "red" PRINT SUBST$("The quick brown fox",10,5,"red") ```