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I'm searching through a file of people that is structured like below

John Smith 555-555-5555 Harvard Square, Boston

I'm interested in finding all the LAST names that start with the a certain letter. I've tried using "grep \

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I suggest you use awk instead of grep e.g. to find lines whose second space-separated field starts with letter S

awk '$2 ~ /^S/' file
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Try using grep with a Regex pattern:

grep -P "(?<=^[A-Za-z]+\\s)A"

This should match all entrys with the last name beginning with A.


Regex explanation

The Lookbehind (?<=text) checks whether text occurs before the actually searched pattern. I use it to skip the first name, which is given by ^[A-Za-z]+\\s, meaning beginning of line (^), then at least one letter, no matter if captital or not, then a space (\\s). After the lookbehind, the actually matched pattern stands, in this case the capital letter A.

  • Try grep -P "^[A-Za-z]+\\sA" instead. It might work without the lookbehind – s3lph Oct 11 '14 at 22:59
  • No still doesn't – Justin Oct 11 '14 at 23:39
  • Do you actually append the file name? – s3lph Oct 11 '14 at 23:40

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