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I need to be able to take a string in Java and determine whether or not all of the characters contained within it are in a specified character set (e.g. ISO-8859-1). I've looked around quite a bit for a simple way to do this (including playing around with a CharsetDecoder), but have yet to be able to find something.
What is the best way to take a string and determine if all the characters are within a given character set?
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The simplest and fastest way to check whether a string contains a substring or not in Python is the "in" operator . This operator returns true if the string contains the characters, otherwise, it returns false .
The Java String contains() method is used to check whether the specific set of characters are part of the given string or not. It returns a boolean value true if the specified characters are substring of a given string and returns false otherwise.
In JavaScript, includes() method determines whether a string contains the given characters within it or not. This method returns true if the string contains the characters, otherwise, it returns false.
Class CharsetEncoder in package java.nio.charset offer a method canEncode to test if a specific character is supported.
Michael basically did something like this:
Charset.forName( CharEncoding.ISO_8859_1 ).newEncoder().canEncode("string")
Note that CharEncoding.ISO_8859_1 rely on Apache commons and may be replaced by "ISO_8859_1".
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I think that the easiest way will be to have a table of which Unicode characters can be represented in the target character set encoding and then testing each character in the string. For the ISO-8859 family, the table can usually be represented by one or a few ranges of Unicode characters, making the test relatively easy. It's a lot of hand work, but needs to be done only once.
EDIT: or use Aubin's answer if the charset is supported in your Java implementation. :)
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