Regular Expressions 101

<a the literal text <a (case sensitive)

Non-Capturing Group(?:(?!</a>).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!</a>)

</a>the literal text </a> (case sensitive)

.any character

mailicon4the literal text mailicon4 (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

gifthe literal text gif (case sensitive)

.*?any character, repeated any number of times

</a>the literal text </a> (case sensitive)

Global pattern flags

s modifier: single line. Allows a dot to match line terminators

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

<a (?:(?!</a>).)*mailicon4\.gif.*?</a>

New

    <a href='abc'>blah blah</a>
    <a class="nonblock nontext" id="u209382" href="mailto:info@example.com">
      <!-- rasterized frame --><img class="temp_no_img_src" id="u209382_img" alt="" width="66" height="66"
        data-orig-src="images/mailicon4-u209382.png?crc=143036675" src="images/mailicon4.gif?crc=4208392903" /></a>
    <a href='abc'>blah blah</a>

Regular Expression

Substitution