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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</span><br><br>What do you notice is different with this pipeline command?<br><br>You will notice that the pattern "the" is matched including larger words that contain the pattern "the". You can use the -w option with the grep command in order to just match only words for a pattern.<br><br># Issue the following linux pipeline command:<br><span style="color:blue;font-weight:bold;font-family:courier;">grep -w -i "the" textfile1.txt | more<br><br>You should now see only strings of text that match the word "the".<br><br>
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