如何编写正则表达式来匹配数字或字母数字单词，而不是没有数字的单词？

Question

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匹配：“123”、“ABC123”、“ABC123”、“10.00”、“ABC.123”、“FOO10.00”

不匹配：“糖”、“拉什”、“XYZ”

在下面的示例字符串中，我想要的匹配以粗体-斜体表示：789--789 ABC 123 10.00 ABC 123 123ABC ABC 123ABC ABC 123.ABC

(?<=^|[\W])(?:[\d]+[A-Za-z]{1,}|[A-Za-z]+[\d]{1,}|[\d]+[.]+[\d]{1,}|[\d]{1,})(?=$|[\W])

Answer 1

(?xi)                # Enable free-spacing and case insensitive mode
\b                   # Word boundary
(?=[A-Z.]*[0-9])     # After any 0+ letters/dots there must be a digit
[A-Z0-9]+            # 1+ letters or digits
(?:\.[A-Z0-9]+)*     # 0+ repetitions of a . and then 1+ letters/digits
\b                   # Word boundary

var Pattern = new Regex(@"
\b                   # Word boundary
(?=[A-Z.]*[0-9])     # After any 0+ letters/dots there must be a digit
[A-Z0-9]+            # 1+ letters or digits
(?:\.[A-Z0-9]+)*     # 0+ repetitions of a . and then 1+ letters/digits
\b                   # Word boundary", 
RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);