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copied!<p>You escape it the way you escape most regex metacharacter: preceding with a backslash.</p> <p>Thus, <code>r"\[harry\]"</code> will match a literal string <code>[harry]</code>.</p> <p>The problem is with the <code>\b</code> in your pattern. This is the <em>word boundary anchor</em>.</p> <p>The <code>\b</code> matches:</p> <ul> <li>At the beginning of the string, if it starts with a word character</li> <li>At the end of the string, if it ends with a word character</li> <li>Between a word character <code>\w</code> and a non-word character <code>\W</code> (note the case difference)</li> </ul> <p>The brackets <code>[</code> and <code>]</code> are NOT word characters, thus if a string starts with <code>[</code>, there is no <code>\b</code> to its left. Any where there is no <code>\b</code>, there is <code>\B</code> instead (note the case difference).</p> <h3>References</h3> <ul> <li><a href="http://www.regular-expressions.info/wordboundaries.html" rel="nofollow noreferrer">regular-expressions.info/Word Boundaries</a></li> <li><a href="http://docs.python.org/library/re.html" rel="nofollow noreferrer">http://docs.python.org/library/re.html</a> <blockquote> <p><code>\b</code> : Matches the empty string, but only at the beginning or end of a word. A word is defined as a sequence of alphanumeric or underscore characters, so the end of a word is indicated by whitespace or a non-alphanumeric, non-underscore character. Note that <code>\b</code> is defined as the boundary between <code>\w</code> and <code>\W</code>, so the precise set of characters deemed to be alphanumeric depends on the values of the UNICODE and LOCALE flags. Inside a character range, <code>\b</code> represents the backspace character, for compatibility with Python’s string literals.</p> </blockquote></li> </ul>

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