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ICU Unicode String Comparison
This demo application illustrates the operation of some of the different string compare functions that are
available in the ICU Unicode support library.
Enter two strings to be compared, then click on the "Submit" button. The results are
described in the Key. For more information, see
Background.
Key to Results
| Result |
Meaning |
| Binary |
Strings have exactly the same code points in Unicode |
| Caseless |
Strings are equal, case insensitive; thus case differences are discarded. Examples: αλφα and Αλφα |
| Equiv |
Strings are canonically equivalent; thus equal after normalization. Examples: Åland and Åland,
or \u062f\u0650\u0651 and \u062f\u0651\u0650. Note that Åland and Åland are also equal in a
caseless match because they both case-fold to the same string. |
| Equiv-Caseless |
Strings are canonically equivalent, case insensitive. Examples: åland and Åland |
| Hex |
Display all input characters as hex values. |
Background
- The above comparisons use only Unicode properties, and are invariant across locales. To
compare two strings according to locale settings, see
ICU Collation
Demo.
- The strings may contain \uhhhh and \Uhhhhhhhh hex escapes for characters that can not be
entered directly from the keyboard. For descriptions of additional escape sequences, see
UnicodeString::unescape() in the
ICU API reference.
- This tool is built using ICU's string comparison functions, showing the effects of the options
for Unicode Normalization (canonical equivalence) and Case Insensitive comparisons.
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