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I'm using the following code to check for a string where all the characters are upper-case letters:
if (preg_match('/^[\p{Lu}]+$/', $word)) {
This works great for English, but fails to detect letters with accents, Russian letters, etc. Is \p{Lu} supposed to work for all languages? Is there a better approach?
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Traverse the string character by character from start to end. Check the ASCII value of each character for the following conditions: If the ASCII value lies in the range of [65, 90], then it is an uppercase letter. If the ASCII value lies in the range of [97, 122], then it is a lowercase letter.
In Python, isupper() is a built-in method used for string handling. This method returns True if all characters in the string are uppercase, otherwise, returns “False”.
The islower() method returns True if all alphabets in a string are lowercase alphabets. If the string contains at least one uppercase alphabet, it returns False.
A special option is the /u which turns on the Unicode matching mode, instead of the default 8-bit matching mode. You should specify /u for regular expressions that use \x{FFFF}, \X or \p{L} to match Unicode characters, graphemes, properties or scripts. PHP will interpret '/regex/u' as a UTF-8 string rather than as an ASCII string.
http://www.regular-expressions.info/php.html --
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