Here are a few title options, keeping in mind the \'question-and-answer\' format you requested: * How to Match Word Boundaries with Special Characters in JavaScript RegExp? * Autocompletion

Javascript RegExp: Word Boundaries and Unicode Characters

When utilizing Javascript's RegExp for autocompletion, handling special characters in languages like Finnish becomes crucial. The traditional approach of matching word boundaries (b) fails to handle characters like ä, ö, and å.

Solution: Unicode Codes

To resolve this issue, we can leverage Unicode codes for these special characters:

[\u00C4,\u00E4,\u00C5,\u00E5,\u00D6,\u00F6] => äÄåÅöÖ

Non-Capturing Group

Instead of b, we can use a non-capturing group to match the beginning of a string or whitespace. This approach allows us to match special characters more effectively:

<code class="javascript">var pattern = "(?:^|\s)" + searchterm;</code>

Breakdown:

• Parentheses and the question mark (:?) form a non-capturing group.
• ^ matches the beginning of a string.
• | is the "or" operator.
• s matches whitespace.

Example:

<code class="javascript">var title = "this is simple string with finnish word tämä on ääkköstesti älkää ihmetelkö";
var searchterm = "äl";

if (new RegExp(pattern, "gi").test(title)) {
    // Match found
}</code>

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