title: Using postgres regexp_replace to replace a list of strings by always the same string
body: <p>Hi i would like to use regexp_replace (or any other postgres function if reasonable) to replace characters in a string by a '', i.e. erase them.</p>
  
  <p>Using regexp_replace(('def4abcdef4ab','4', '','g') i can replace/erase all  occurrences of '4', but i want to also replace all occurences of 'e' and b' in the same process, without using several nested processes like  regexp_replace(regexp_replace(regexp_replace())).</p>
  
  <p>i.e. i want to be able to provide a short list of different strings which then should be replace by a unique string.</p>
  
  <p>Any ideas? Thanks a  lot in advance!</p>