regex101: PCRE (Legacy) Match Workspace

\ban ASCII word boundary

Negative Lookbehind(?<![-#/])

Character Class[-#/]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

literalthe literal text literal (case insensitive)

Negative Lookahead(?!</a>)

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

\ban ASCII word boundary

Global pattern flags

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

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

Search reference

Regular Expression

\b(?<![-#/])literal(?!</a>)\b

New

<p>Literal in computer science is a
<a href='http://www.google.com/something/literal#literal'>literal</a>
for representing a fixed value in source code. Almost all programming 
<a href='http://www.google.com/something/else-literal#literal'>languages</a>
have notations for atomic values such as integers, floating-point 
numbers, and strings, and usually for booleans and characters; some
also have notations for elements of enumerated types and compound
values such as arrays, records, and objects. An anonymous function
is a literal for the function type which is LITERAL</p>

Regular Expressions 101

Regular Expression

Substitution