Zero or one of a

a?

Matches an `a` character or nothing.

Examples

Match Sample:

ba b a

Regex Example:

ba?

JAVASCRIPT PYTHON PCRE

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<!-- Embed Regex Token: a? -->
<code class="regex-token">a?</code> - Zero or one of a
<small><a href="https://testregex.com/cheatsheet/zero-or-one-of-a">See details</a></small>