Extract a string from another string in UNIX

qwertyu · #1 01-21-2013

I have a string

string="Please have a nice day and sleep well Replace_12123_31233_32134_12342 Good day"

How do i replace "Replace_12123_31233_32134_1234" in the above string.??

Please help.

Regards,
Qwerty

elixir_sinari · #2 01-21-2013

bash/ksh93:

Code:

$ string="Please have a nice day and sleep well Replace_12123_31233_32134_12342 Good day"

$ string=${string//Replace_12123_31233_32134_12342/REPLACED}

$ echo $string
Please have a nice day and sleep well REPLACED Good day

qwertyu · #3 01-21-2013

i do not require to replace that with "Replaced". i want to take out that string - "Replace_12123_31233_32134_12342" and do certain operations with it... this might be a different string everytime... but the position of the string wouldnt change..

elixir_sinari · #4 01-21-2013

Quote:

Originally Posted by qwertyu

i do not require to replace that with "Replaced". i want to take out that string - "Replace_12123_31233_32134_12342" and do certain operations with it

Didn't you write "How do i replace "Replace_12123_31233_32134_1234" in the above string.??" earlier?

Quote:

Originally Posted by qwertyu

... this might be a different string everytime... but the position of the string wouldnt change..

Please elaborate on this aspect. At what position will "this" string occur in the bigger string? Does "this" string terminate with a space/end-of-bigger-string? or does "this" string have a fixed length?

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