Regular expression to validate sql's Post: 302856077

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Is it possible to combine a regular expression with a aritmetical expression? For example, taking a 8-numbers caracter sequece and casting each output of a grep, comparing to a constant. THX!

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Regular expression to extract "y" from "abc/x.y.z"

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Hi, I need some help. My task is, to write a "one-line" command, which must use ls and awk. Task: Write a command-line, which should rename all files in dir from form "value1.dok" to "value2.doc". And value2=value1+1. For example: ls | awk -F: '{print "mv "$0" "$1+1".doc"}' | sh But...