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You need to compare two strings.
Use the comparison functions from the string library for equality:
1> string:equal("ABC", "abc"). false 2> string:equal("abc", "abc"). true
You can use the normal equality operators for sorting and other types of comparisons:
3> G = "ABC". "ABC" 4> L = "abc". "abc" 5> G > L. false 6> G < L. true 7> G >= L. false 8> G =< L. true
Note that lower case characters are considered greater than uppercase in these orderings.
Note that case insensitive versions of these functions are not available, though you can always use the httpd_util library to_lower or to_upper functions to put the two strings on an equal footing:
9> string:equal(httpd_util:to_lower("AAA"), "aaa"). true