Hello, Dear Readers, In this post, I will share some deep insights into regular pattern searching using grep, awk, and sed. In VLSI/EDA flows, engineers frequently work with large Innovus, Voltus, STA, EMIR, synthesis and simulation reports. Linux commands such as grep , awk , and sed provide a fast way to search, filter and process this data without opening huge files manually. 1. Regular Expressions: A regular expression (regex) defines a pattern for searching text. Common patterns: Pattern Meaning Example . Any character V.D * Zero or more ab* + One or more ab+ [0-9] Digit U [0-9] [a-z] Lowercase [a-z] + ^ Start of line ^VDD $ End of line VDD$ ` ` OR `VDD VSS` For example: grep -E 'ERROR|WARNING|FATAL' voltus.log Searches for any of the three patterns. 2. grep — Search and Filter: grep is mainly used to find matching lines . Basic search grep 'VIOLATION' report.rpt Case-insensitive search grep -i 'error' run.log Show line numbers grep -n 'VIOLATION...
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