Regular expression to match PHP function names.
See also
http://php.net/manual/language.functions.php
File
- core/includes/bootstrap.inc, line 95
- Functions that need to be loaded on every Drupal request.
Code
const DRUPAL_PHP_FUNCTION_PATTERN = '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*';
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