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<?php var_dump(preg_match('~[-abc]~', '-')); // possible au début var_dump(preg_match('~[abc-]~', '-')); // possible à la fin var_dump(preg_match('~[^-abc]~', 'A')); // possible juste aprés le caractère de négation de classe ^ var_dump(preg_match('~[a-z-0]~', '-')); // possible aprés un range var_dump(preg_match('~[a-z-\s]~', '-')); // idem var_dump(preg_match('~[a-z-0-9]~', '-')); // idem // possible jusqu'à PHP 7.2 inclus // mais interdit à partir de PHP 7.3 var_dump(preg_match('~[\s-0-9]~', '-')); // aprés un raccourci de classe de caractères var_dump(preg_match('~[\p{N}-G]~', '-')); // aprés une classe UNICODE var_dump(preg_match('~[[:xdigit:]-G]~', '-')); // aprés une classe POSIX
Output for git.master, git.master_jit, rfc.property-hooks
int(1) int(1) int(1) int(1) int(1) int(1) Warning: preg_match(): Compilation failed: invalid range in character class at offset 3 in /in/f99lc on line 13 bool(false) Warning: preg_match(): Compilation failed: invalid range in character class at offset 6 in /in/f99lc on line 14 bool(false) Warning: preg_match(): Compilation failed: invalid range in character class at offset 11 in /in/f99lc on line 15 bool(false)

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