Question

I tried this, but it seems to work only with alphanumeric characters?

\ba\w*\b  <- works
\b-\w*\b  <- doesn't work

How can I remove all the words from a string that starts with a hyphen?

Answer 1

preg_replace(“/-\w+/”, “”, “-000 aaa -bbb ccc -ddd -eee”)

gives:
aaa ccc

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EDITED 3 times: As noticed in the comments – be it a stretch of the original question or not – all the suggested variants didn’t work with -xx-yy-zz or qq-ww-ee, or -äüö. This one :

preg_replace("/(\s?)(?<=\s|^)(-)\S*\s*/", "$1", "-000 aaa -bbb ccc -ddd -eee-eee-eee -äüö fff-qqq-rrr äüö2 äüö-äüö-3 -ggg");

… produced the following:

 aaa ccc fff-qqq-rrr äüö2 äüö-äüö-3

Limitations apply: accented characters are acceptable; multibyte ones would certainly be a stretch.