awk and special brackets delimiters

Question

I have data in the following format:

.......{INFO1}.....[INFO2]....

For awk it should be really simple to pick up the IN

Answer 1

Just use [][{}] to define that you can use either of these: [, ], { or } as field separators

awk -F"[][{}]" '{print ...}' file

In general, you say -F"[PATTERNS]".

Test

$ echo ".......{INFO1}.....[INFO2]...." | awk -F"[][{}]" '{print $2}'
INFO1
$ echo ".......{INFO1}.....[INFO2]...." | awk -F"[][{}]" '{print $4}'
INFO2

Answer 2

You just have to add {} to the field separator:

~$ echo ".......{INFO1}.....[INFO2]...." | awk -F'[][{}]' '{print $2,$4}'
INFO1 INFO2

Answer 3

 $ echo '.......{INFO1}.....[INFO2]....' | awk -F'[][{}]' '{print $2}'
INFO1

Answer 4

grep -oP '(?<=[{\[]).*?(?=[\]}])'