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Data Intro for Archivists
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<h1>Reference</h1>
<p> Last updated on 2023-04-24 |
<a href="https://github.com/librarycarpentry/lc-data-intro-archives/edit/main/learners/reference.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
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<h1 id="regular-expressions-cheat-sheet">Regular Expressions Cheat Sheet<a class="anchor" aria-label="anchor" href="#regular-expressions-cheat-sheet"></a></h1>
<ul><li>
<code>[]</code> defines a range of characters</li>
<li>
<code>.</code> matches any character</li>
<li>
<code>\</code> is used to escape the following character when that
character is a special character. So, for example, a regular expression
that found <code>.com</code> would be <code>\.com</code> because
<code>.</code> is a special character that matches any character.</li>
<li>
<code>\d</code> matches any single digit</li>
<li>
<code>\w</code> matches any part of word character (equivalent to
<code>[A-Za-z0-9]</code>)</li>
<li>
<code>\s</code> matches any space, tab, or newline</li>
<li>
<code>^</code> asserts the position at the start of the line. So
what you put after it will only match if they are the first characters
of a line.</li>
<li>
<code>$</code> asserts the position at the end of the line. So what
you put before it will only match if they are the last characters of a
line.</li>
<li>
<code>\b</code> adds a word boundary. Putting this either side of a
stops the regular expression matching longer variants of words.</li>
<li>
<code>*</code> matches the preceding element zero or more times. For
example, <code>ab*c</code> matches “ac”, “abc”, “abbbc”, etc.</li>
<li>
<code>+</code> matches the preceding element one or more times. For
example, <code>ab+c</code> matches “abc”, “abbbc” but not “ac”.</li>
<li>
<code>?</code> matches when the preceding character appears one or
zero times</li>
<li>
<code>{VALUE}</code> matches the preceding character the number of
times define by VALUE; ranges can be specified with the syntax
<code>{VALUE,VALUE}</code>
</li>
<li>
<code>|</code> means or</li>
<li>Check your regex with: regex101 <a href="https://regex101.com/" class="external-link">https://regex101.com/</a>, rexegper <a href="https://regexper.com/" class="external-link">http://regexper.com/</a>, or myregexp <a href="%5Bhttp://myregexp.com/%5D" class="external-link">http://myregexp.com/</a>
</li>
<li>Test yourself with: Regex Crossword <a href="https://regexcrossword.com/" class="external-link">https://regexcrossword.com/</a> or
our The Multiple Choice Quiz <a href="https://data-lessons.github.io/library-data-intro/05-quiz/" class="external-link">http://data-lessons.github.io/library-data-intro/05-quiz/</a>
</li>
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End Matomo Code --></body></html><!-- END: inst/pkgdown/templates/layout.html-->