Removing characters from tel. number

[oldschool]

Can anyone tell me how to remove all non-number characters from a string such as a tel. number before it is inserted into a database?
Thank you.

[ray326]

Use a StringBuffer. Loop through the tel num String and append each numerical character (test with Character.isDigit(ch)) to the StringBuffer. Use the content of the StringBuffer as the value for the database field.

[nspils]

The same will work with StringBuilder, which provides the same functionality at a faster speed (unless you need to work with threads and this method has to be synchronized).