awk: multiple delimiters 

$ awk -F"#|_" '{print $2}' file  how  am

Where the files are numbered as follows:

hello#how_are_you           i#am_very#well_thank#you  ^^^^^ ^^^ ^^^ ^^^           ^ ^^ ^^^^ ^^^^ ^^^^^ ^^^    1    2   3   4            1  2   3    4    5    6

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