Hannes :
According to Apache Commons Lang's documentation for StringUtils.isNumeric(), the String '१२३' is numeric.
Since I believed this might be a mistake in the documentation, I ran tests to verify the statement. I found that according to Apache Commons it is numeric.
Why is this String numeric? What do those characters represent?
Andy Turner :
Because that "CharSequence contains only Unicode digits" (quoting your linked documentation).
All of the characters return true for Character.isDigit:
Some Unicode character ranges that contain digits:
- '\u0030' through '\u0039', ISO-LATIN-1 digits ('0' through '9')
- '\u0660' through '\u0669', Arabic-Indic digits
- '\u06F0' through '\u06F9', Extended Arabic-Indic digits
- '\u0966' through '\u096F', Devanagari digits
- '\uFF10' through '\uFF19', Fullwidth digits
Many other character ranges contain digits as well.
१२३ are Devanagari digits:
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