php regex word boundary matching in utf-8

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Even in UTF-8 mode, standard class shorthands like \w and \b are not Unicode-aware. You just have to use the Unicode shorthands, as you worked out, but you can make it a little less ugly by using lookarounds instead of alternations:

/(?<!\pL)weiß(?!\pL)/u

Notice also how I left the curly braces out of the Unicode class shorthands; you can do that when the class name consists of a single letter.

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