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Update boundary_matchers.html
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For example,</p>
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<div class="container">
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<iframe scrolling="no" style="position: absolute; top: -9999em; visibility: hidden;" onload="this.style.position='static'; this.style.visibility='visible';" src="https://regexr.com/4vtsb" class="embed"></iframe>
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<iframe scrolling="no" style="position: absolute; top: -9999em; visibility: hidden;" onload="this.style.position='static'; this.style.visibility='visible';" src="https://regexr.com/4vuof" class="embed"></iframe>
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</div></li>
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<p>It will show a match, only if the pattern is occuring at the start of the line.</p>
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<li><p><strong>Anchor <code>$</code></strong>: Similarly, <code>$</code> is used to match patterns at the very end of a line.</p>
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<div class="container">
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<iframe scrolling="no" style="position: absolute; top: -9999em; visibility: hidden;" onload="this.style.position='static'; this.style.visibility='visible';" src="https://regexr.com/4vtsb" class="embed"></iframe>
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<iframe scrolling="no" style="position: absolute; top: -9999em; visibility: hidden;" onload="this.style.position='static'; this.style.visibility='visible';" src="https://regexr.com/4vuol" class="embed"></iframe>
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</div>
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<p>It will show a match, only if the pattern is occuring at the end of a line.</p>
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<p>Predict the output of the following regex:</p>
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<ol>
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<li><strong>RegEx:</strong> <code>^[\w$#%@!&^*]{6,18}$</code> <br>
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<li><strong>RegEx:</strong> <code>^[\wYou can't use 'macro parameter character #' in math mode</code> <br>
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<strong>Text:</strong>
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<code>This is matching passwords of length between 6 to 18:
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Abfah45$
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