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→INVESTIGATION 1: SIMPLE & COMPLEX REGULAR EXPRESSIONS
# Issue the following Linux pipeline command:<br><span style="color:blue;font-weight:bold;font-family:courier;">grep -w -i "^the" textfile1.txt | more</span><br><br>The '''^''' symbol is an anchor. In this case, it only matches the <u>word</u> "the" (both upper or lowercase) at the beginning of strings.<br>The '''$''' symbol is used to anchor patterns at the end of strings.<br><br>
# Issue the following Linux pipeline command:<br><span style="color:blue;font-weight:bold;font-family:courier;">grep -w -i "the$" textfile1.txt | more</span><br><br>What do you notice?<br><br>
# Issue the following Linux pipeline command to anchor the work "the" simultaneously at the beginning and the end of the string:<br><span style="color:blue;font-weight:bold;font-family:courier;">grep -w -i "^the$" textfile1.txt | more</span><br><br>What do you notice?<br><br>Anchoring patterns at both the <u>beginning </u> and the end <u>ending</u> of strings can greatly assist for more complex search patterns.<br>We will now be demonstrating simultaneous anchoring with other complex regular expressions symbols.<br><br>
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