Regular Expressions 101

<trthe literal text <tr (case sensitive)

\ban ASCII word boundary

Negated Character Class[^<]*

*matches any number of characters outside the set below:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Negated Character Class[^<]*

*matches any number of characters outside the set below:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Non-Capturing Group(?:<(?!tr\b)[^<]*)*

*repeats the group contents below any number of times:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Negative Lookahead(?!tr\b)

trthe literal text tr (case sensitive)

\ban ASCII word boundary

Negated Character Class[^<]*

*matches any number of characters outside the set below:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

HelloWorldthe literal text HelloWorld (case sensitive)

Negated Character Class[^<]*

*matches any number of characters outside the set below:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Non-Capturing Group(?:<(?!\/tr>)[^<]*)*

*repeats the group contents below any number of times:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Negative Lookahead(?!\/tr>)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

tr>the literal text tr> (case sensitive)

Negated Character Class[^<]*

*matches any number of characters outside the set below:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

tr>the literal text tr> (case sensitive)

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

<tr\b[^<]*>[^<]*(?:<(?!tr\b)[^<]*)*HelloWorld[^<]*(?:<(?!\/tr>)[^<]*)*<\/tr>

New

<tr>
OtherElement
</tr>
<tr>more 
HelloWorld
text
here
</tr>