Grep magic

Comments

• Mason AdministratorOG

  May 2022

  @legendary said: This is bad. I want EXACT match.

  Is the "FROM" that you're after always at the start of a new line? If so, just change it to:

  grep -oP "(?<=^FROM=\').*?(?=\')"

  and it won't pick up the "ENV_FROM".

  Thanked by (2)Falzo legendary

  Humble janitor of LES
  Proud papa of YABS
• nullnothere OG

  May 2022

  Does: grep -oP "(?<=\bFROM=\').*?(?=\')" solve it for you? (I added \b before FROM to signify word boundary and it worked as I think how you'd like it to work - i.e only match FROM and not ENV_FROM).

  Here's a sample test case from me:

  (the first one is with a capital - not what you want, and the second one is with a lower case - I think what you want).

  echo "foo FROM='from_address' bar ENV_FROM='env_from_address' junk suffix\nFROM='Mr. Void <[email protected]>'|||ENV_FROM='<[email protected]>'\nfoo ENV_FROM='hello_how_are_you' bar FROM='howdy' baz" | grep -oP "(?<=\BFROM=\').*?(?=\')"
  
  

  gives me:

  env_from_address
  <[email protected]>
  hello_how_are_you
  

  And what I think you want is:

  echo "foo FROM='from_address' bar ENV_FROM='env_from_address' junk suffix\nFROM='Mr. Void <[email protected]>'|||ENV_FROM='<[email protected]>'\nfoo ENV_FROM='hello_how_are_you' bar FROM='howdy' baz" | grep -oP "(?<=\bFROM=\').*?(?=\')"
  
  

  gives me:

  from_address
  Mr. Void <[email protected]>
  howdy
  

  Thanked by (3)Mason Falzo legendary
• legendary

  May 2022

  @nullnothere said:
  Does: grep -oP "(?<=\bFROM=\').*?(?=\')" solve it for you? (I added \b before FROM to signify word boundary and it worked as I think how you'd like it to work - i.e only match FROM and not ENV_FROM).

  Here's a sample test case from me:

  (the first one is with a capital - not what you want, and the second one is with a lower case - I think what you want).

  echo "foo FROM='from_address' bar ENV_FROM='env_from_address' junk suffix\nFROM='Mr. Void <[email protected]>'|||ENV_FROM='<[email protected]>'\nfoo ENV_FROM='hello_how_are_you' bar FROM='howdy' baz" | grep -oP "(?<=\BFROM=\').*?(?=\')"
  
  

  gives me:

  env_from_address
  <[email protected]>
  hello_how_are_you
  

  And what I think you want is:

  echo "foo FROM='from_address' bar ENV_FROM='env_from_address' junk suffix\nFROM='Mr. Void <[email protected]>'|||ENV_FROM='<[email protected]>'\nfoo ENV_FROM='hello_how_are_you' bar FROM='howdy' baz" | grep -oP "(?<=\bFROM=\').*?(?=\')"
  
  

  gives me:

  from_address
  Mr. Void <[email protected]>
  howdy
  

  Yes, \b did the trick. Thank you for your time and effort. Greatly appreciated.