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Exemplo #1 Exemplos de expressões válidas
/<\/\w+>/
|(\d{3})-\d+|Sm
/^(?i)php[34]/
{^\s+(\s+)?$}
Exemplo #2 Exemplos de expressões inválidas
/href='(.*)' - faltando o delimitador final
/\w+\s*\w+/J - modificador 'J' desconhecido
1-\d3-\d3-\d4| - faltando delimitador inicial
