The offset defines from which starting position to search, and the return value is `–1` if no match is found. The offset returned is *0*-based, and to search in the whole string, a start offset of *0* would be used.
-- **substring(string, startpos, length)** returns part of a string. The offset is *0*-based here, too.
+- **strreplace(old, new, string)** searches for certain characters in a string and replaces them with other characters, as in:
+ ```c
+ strreplace("de", "con", "destruction") == "construction";
+ ```
+
+- **substring(string, startpos, length)** returns part of a string.
+
+The offset is *0*-based here, too. A length of `-1` designates the end of the string (it will return the part of the string after the start position), a length of `-2` designates the penultimate character of the string, and so on.
+
+- **strtoupper(string)** capitalizes a string.
+- **strtolower(string)** lowercases a string.
Note that there are different kinds of *strings*, regarding memory management:
string strcat(string a, string b, ...) = #115;
```
-The function/field syntax is ambiguous. In global scope a declaration can be a variable, field or function. In local scope, it's always a variable. The `var` keyword can be used in global scope to treat is as local scope (always declaring a variable). The following table shows declarations in global scope:
+The function/field syntax is ambiguous. In global scope a declaration can be a variable, field or function. In local scope, it's always a variable. The `var` keyword can be used in global scope to treat it as local scope (always declaring a variable). The following table shows declarations in global scope:
| Example code | Meaning |
|--------------|---------|