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Old 03-15-2010
As malcome said when I used grep -E or egrep it worked fine.Even if you're facing problem.You can match that pattern with grep itself as following.

Code:
grep  "[0-9]\{3\}-[0-9]\{2\}-[0-9]\{4\}\|[0-9]\{9\}" <filename>


If you want the particular line in a file should contain only the number in above format use the following.

Code:
grep  "^[0-9]\{3\}-[0-9]\{2\}-[0-9]\{4\}$\|^[0-9]\{9\}$" <filename>

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MBK_IN_LO(1)						     MBK ENVIRONMENT VARIABLES						      MBK_IN_LO(1)

NAME
MBK_IN_LO - define the logical input format of mbk and genlib SYNOPSYS
c-shell running setenv MBK_IN_LO format ORIGIN
This software belongs to the ALLIANCE CAD SYSTEM developed by the ASIM team at LIP6 laboratory of Universite Pierre et Marie CURIE, in Paris, France. Web : http://asim.lip6.fr/recherche/alliance/ E-mail : alliance-users@asim.lip6.fr DESCRIPTION
MBK_IN_LO sets the logical input format of the mbk database. The database will be filled with informations found in the given format file. valid formats are : - al, alx, that are alliance logical formats - edi, that is edif standart netlist format - hns, fns, fne, fdn, hdn, that are vti logical formats - spi, that's spice netlist - vst, that structural vhdl description ERRORS
"MBK_IN_LO : 'xxx' unknown format" The argument given to the setenv is not a legal logical input format for mbk. You must changed it before any other action. EXAMPLE
setenv MBK_IN_LO al SEE ALSO
mbk(3), genlib(1), MBK_OUT_LO(1). BUG REPORT
This tool is under development at the ASIM department of the LIP6 laboratory. We need your feedback to improve documentation and tools. ASIM
/LIP6 October 1, 1997 MBK_IN_LO(1)