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¿Cómo usar dos patrones en la entrada?

Así que tengo una entrada como:

 <input type="text" name="firstname" id="firstname" placeholder="Name" maxlength="15" pattern="^[a-zA-ZąćęłńóśżźĄĆĘŁŃÓŹŻŚ]+$" autofocus required >

Ahora necesito agregar otra 'validación' que detecte si en esta entrada aparece una de las siguientes palabras: ['perro', 'gato']

Entonces, me gustaría agregar patern o algo más, qué verifique si input pass pattern="^[a-zA-ZąćęłńóśżźĄĆĘŁŃÓŹŻŚ]+$" y no deje pasar ninguna palabra de esta matriz ['dog', 'cat']

about 4 years ago · Juan Pablo Isaza
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tal vez usando lookahead, intente reemplazar su patrón por:

 (?=^[a-zA-ZąćęłńóśżźĄĆĘŁŃÓŹŻŚ]+$)(?=^(?!.*cat|.*dog).*$)
about 4 years ago · Juan Pablo Isaza Report
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