mySQL regex in the where clause

Question

SELECT telephone_number
FROM table
WHERE telephone_number REGEXP \'^1[() -]*999[() -]*999[() -]*9999$\';

how do i make so its valid for any number

Answer 1

SELECT telephone_number
  FROM table
 WHERE telephone_number REGEXP '[1]?[(]?[[:DIGIT:]]{3}[)]?[-]?[[:DIGIT:]]{3}[-]?[[:DIGIT:]]{4}'