我可以使用通配符来解决这个问题吗？

Question

I'm learning Java and I have a simple problem but I'm stuck.

I need to search a string for the text "bob", except the "o" can be any character. Is there a wildcard character I can use, or another simpler method?

Thanks in advance

Answer 1

You can use the matches() method with the right regex:

if (str.matches(".*b.b.*"))

Note that the regex must match the whole string to return true .

If you want to match the word "bob", you'll need "word boundaries":

if (str.matches("(?i).*\\bb[a-z]b\\b.*"))

Note that the "case insensitive" flag has been added to allow any case to match.

Answer 2

This regex matches a whole word starting and ending with 'b' with any alpha-numeric (or underscore) character between:

\bb\wb\b

To match any lowercase letter between, use

\bb[a-z]b\b

To match any letter between, use

\bb[a-zA-Z]b\b

To escape these for Java strings, change each \\ to \\\\