Regular Expressions 101

Instagramthe literal text Instagram (case sensitive)

Negative Lookahead(?!.+\<\/a\>)

.+any character (except for line terminators), repeated at least once

\<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

\>the literal > (62₁₀ / 76₈ / 3E₁₆)

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

Instagram(?!.+\<\/a\>)

New

<p>This is a test piece of text that contains the keywords in my array like <a>Photos</a>, C.V., CV, <a>Google</a>, <a>Github</a>, <a>Portfolio</a>, Instagram, <a>email</a> and Simon, ignoring the keywords if they're existing <a href="#">Simon links</a>.</p>

Regular Expression

Extraction