How to Identify Keywords in HTML Text Excluding Anchors Using Regular Expressions?

Finding Keywords in HTML Text Excluding Anchors

In parsing HTML, it's often necessary to manipulate text while considering the context within HTML tags. One common task is to identify keywords and replace them with appropriate HTML links, excluding any keywords already contained within anchor tags.

Matching Keywords

To match occurrences of a keyword while excluding those within anchor tags, a regular expression with a negative lookahead is employed:

~Moses(?!(?>[^<]*(?:<(?!/?a\b)[^<]*)*)</a>)~i

This expression includes the following components:

• Moses: The keyword to be matched.
• (?!(?>¹(?:<²))): A negative lookahead that checks for the absence of an opening anchor tag (↩
• /?ab)[^L ↩

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