Identifiers and keywords

The rexx interpreter is case insensitive. This means that identifier names and keywords containing lowercase letters are considered to be the same as those containing uppercase letters:

/* These variables are all the same */

count = 1
Count = COUNT + 1
say count

Literal Strings

Lettercase is preserved within literal strings:

say 'Hello!'  /* Hello! */
SAY 'HELLO!'  /* HELLO! */

Comparison of Strings

In rexx, the comparative operators are case sensitive , so strings containing differing letter cases will not be interpreted as matching strings:

if "abc" = "ABC" then
  say "The strings are the same!"    /* This does not happen because the strings are not the same */