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→INVESTIGATION 1: SIMPLE & COMPLEX REGULAR EXPRESSIONS
# View the contents of the '''textfile1.txt''' file using the '''more''' command and quickly view the contents of this file. When finished, exit the more command.<br><br>Although there are several Linux commands that use regular expressions, we will only be using the grep command for this section.<br><br>
#Issue the following linux pipeline command to match the pattern the within '''textfile1.txt''':<br><span style="color:blue;font-weight:bold;font-family:courier;">grep "the" textfile1.txt | more<br><br>
# Now, issue the grep linux pipeline command with the '''-i''' option to ignore case sensitively:<br><span style="color:blue;font-weight:bold;font-family:courier;">grep -i "the" textfile1.txt | more<br><br>What do you notice is different with this pipeline command?<br><br># x
=INVESTIGATION 2: EXTENDED REGULAR EXPRESSIONS =
