How to compare Unicode characters that “look alike”?

Question

I fall into a surprising issue.

I loaded a text file in my application and I have some logic which compares the value having µ.

And I realized that even if

Answer 1

Search both characters in a Unicode database and see the difference.

One is the Greek small Letter µ and the other is the Micro Sign µ.

Name            : MICRO SIGN
Block           : Latin-1 Supplement
Category        : Letter, Lowercase [Ll]
Combine         : 0
BIDI            : Left-to-Right [L]
Decomposition   :  GREEK SMALL LETTER MU (U+03BC)
Mirror          : N
Index entries   : MICRO SIGN
Upper case      : U+039C
Title case      : U+039C
Version         : Unicode 1.1.0 (June, 1993)

---

Name            : GREEK SMALL LETTER MU
Block           : Greek and Coptic
Category        : Letter, Lowercase [Ll]
Combine         : 0
BIDI            : Left-to-Right [L]
Mirror          : N
Upper case      : U+039C
Title case      : U+039C
See Also        : micro sign U+00B5
Version         : Unicode 1.1.0 (June, 1993)