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Asked: 2026-06-10T15:28:36+00:00

I have the following string: Perl is the only language that looks the same

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I have the following string:
“Perl is the only language that looks the same before and after RSA encryption.” 🙂
This pattern "\\p{javaUpperCase}.*\\." looks for uppercase character and period. It returns true for that string, but if I remove word “Perl” it’ll give me false. Why is that? There’s still “RSA” word, which is uppercase too.

\p{javaUpperCase} – stands for UpperCase character
. means any character after that UpperCase
* is Greedy quantifiers, one or more times
\\. – period.

Where am I wrong? Why does it look only at the beginning and at the end?

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1 Answer

  1. Editorial Team

    Probably because it is trying to match the whole string. (Reference: http://www.regular-expressions.info/java.html says “It is important to remember that String.matches() only returns true if the entire string can be matched”). Depending on what regular expression library/function you use, it might require a match on everything.

    Without “Perl”, the string doesn’t start with an uppercase character, so even though a substring matches, the whole string doesn’t.

    Try .*(\p{javaUpperCase}.*\.).* to match substrings.

    The .* added on both ends allows extra characters on either end of the substring of interest.

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