# Basic syntax:
awk '{ for(i=1; i<=NF; i++) { if($i ~ /^string/) { print $i }}}' your_file
# Where:
# - for(i=1; i<=NF; i++) - this loops through the fields in each row of
# your_file, starting at field 1 and ending at the number of fields
# NF in the current row. Without using a custom delimiter, awk
# treats spaces, tabs, and new lines as delimiters.
# - if($i ~ /^string/) - this checks if $i (the current field) begins
# with "string". The tilde character (~) is shorthand for "check
# the operands on either side to see if they match". /^string/ is
# a regex expression where ^ indicates the beginning of the text.
# If the if statement is true, the action (print $i) is performed.