Java files in kmy/regex/tools can be used as sample source code. Examples:
java kmy.regex.tools.Grep '<(\w+)>.*\1'will find all the lines where some word is used twice.
java kmy.regex.tools.Subst '\(@n(\d+)\)' '[${n%x}]'
will replace all decimal integer numbers in brackets with
hexadecimal numbers in square brackets.
These are some speed comparisons. Note that this cannot really be used to benchmark JVM, as regex compiler generates fairly unusual (but legal) sequence of bytecodes. This results were obtained using 'retest -cpR', 'retest -pR' and 'regex.perl -p'.
| Platform | JVM | kmy-regex (compiled) | kmy-regex (interpreted) | perl (for comparison) |
|---|---|---|---|---|
| Linux, Pentium Pro, 200MHz | IBM JDK 1.1.6 (JIT) | [crashed] | 7.41 | 2.45 |
| IBM JDK 1.1.6 (no JIT) | 6.21 | 52.27 | ||
| Sun JDK 1.2.2 (no JIT) | 6.28 | 61.47 | ||
| kaffe 1.05 | [failed] | 26.94 | ||
| Sun SPARC, 300MHz | classic JVM 1.2 (JIT) | 4.23 | 12.38 | 1.98 |
| classic JVM 1.2 (no JIT) | 4.63 | 38.96 | ||
| NT 4.0, Pentium II, 400MHz | Sun JVM 1.2 (JIT) | 0.68 | 5.42 | 1.22 |
| Microsoft, jview, (JIT) | 4.95 | 4.45 |