[PHP] Removing commas from number

[Todd Cary]

Thanks to the suggestions, I use number_format($my_number, 2) to format the 
number in an edit field.  Now I need to reenter it into MySQL.  How should I use 
preg_replace to remove the commas?

This removes the commas *and* the decimal point:
preg_replace('/\D/', '', $str)

In reviewing patterns, I cannot find the purpose of the "/" character in the 
above.

Many thanks....

Todd

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