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Re^3: A Perl vs. Java fight brewsby emazep (Priest) |
on Jul 25, 2006 at 10:11 UTC ( [id://563466]=note: print w/replies, xml ) | Need Help?? |
Though regex support in Java was introduced several years ago (but not that many: JDK 1.4 AFAIK, 2002 circa, if we mean the java.util.regex package), it still doesn't offer advanced things such as match-time code evaluation, match-time pattern interpolation and conditional interpolation.
So, for example, with a Java regex you can't build a recursive pattern (to check for instance if the parentheses in a text are balanced), while in Perl you can ;-) Update It can also be interesting to see how more verbose Java regexes are compared to Perl regexes. Here is a simple Perl example: and here is its Java counterpart: Really, the above 2 last lines could be substituted by the following somewhat shorter code: but if you don't explicitly instantiate a Matcher object, you can't have several things such as match, prematch, postmatch etc. which Perl gives you for free (through the various predefined variables $&, $`, $' etc.) Ciao, Emanuele.
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