postgresql - replace all instances of a string within text field

Question

In postgresql, how do I replace all instances of a string within a database column?

Say I want to replace all instances of cat with dog, fo

Answer 1

You can use the replace function

UPDATE your_table SET field = REPLACE(your_field, 'cat','dog')

The function definition is as follows (got from here):

replace(string text, from text, to text)

and returns the modified text. You can also check out this sql fiddle.