regex101: PCRE (Legacy) Match Workspace

<h4>the literal text <h4> (case sensitive)

Non-Capturing Group(?:(?!<\/?h4>).)*?

*?repeats the group contents below any number of times:

Negative Lookahead(?!<\/?h4>)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

h4>the literal text h4> (case sensitive)

.any character

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

h4>the literal text h4> (case sensitive)

Negative Lookahead(?!.*?<div class='content'>)

.*?any character, repeated any number of times

<div class='content'>the literal text <div class='content'> (case sensitive)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

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

Search reference

Regular Expression

<h4>(?:(?!<\/?h4>).)*?<\/h4>(?!.*?<div class='content'>)

New

<div class='content'>
    <img style='border-style: solid; border-width: 1px;' src='/media/uploads/defaults/181'/><br/><br/>
    <div class='imgCaption'>
        Reverse Osmosis Caption
    </div>
</div>
<pagebreak/>
<h3>Access </h3>
<h4>Type</h4>
<div class='content'>
    Your plumbing system is accessible with a Main Shut off Valves
</div>
<h4>Location</h4>
<pagebreak/>
<h3>Operation & maintenance #1</h3>
<div class='content'>
    All wastewater treatment systems and their components require regular maintenance.
</div>
<h4>Activity</h4>

Regular Expressions 101

Regular Expression

Substitution