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The character class \w matches an alphanumeric character, so it matches a digit as well as a letter (or underscore). You need a character class which excludes digits. But \D includes anything not a digit, so it matches whitespace. A negated character class [^\d\s] will match a character that is neither a digit nor a space:
Or, more simply, specify the letters you want to match explicitly (note the /i modifier to make the regex case-insensitive):
See the section “Character Classes and other Special Escapes” in perlre#Regular-Expressions. Hope that helps,
In reply to Re: regex search for words with one digit
by Athanasius
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