How to Match Whole Words Only Using Regex in C#?

Only match the whole word in C# regular expression

Question:

In C#, how to construct a regular expression to match an entire word in a given keyword list? Specifically, given the following list of keywords:

<code>string keywords = "(shoes|shirt|pants)";</code>

We want to match these words in a text string, but discard partial matches such as "participants" if we are only interested in the exact word "pants".

Answer:

To ensure that the regular expression matches the entire word, we need to include word boundaries, represented by the b symbol. b represents the boundary between word and non-word characters.

The modified regular expression is as follows:

<code>\b(shoes|shirt|pants)\b</code>

When used as a condition in a Regex.Match statement, this expression will only match whole words that exactly match any keyword in the given list.

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