regex: java.util.regex companion code (groups, lookarounds, replaceAll lambdas, ReDoS and timeouts)

Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01KqJyCidz3ZgRyHABv2GVJh
2026-09-30 19:00:39 +00:00
parent bfa7f97432
commit b31c6716a3
22 changed files with 647 additions and 0 deletions
@@ -0,0 +1,12 @@
+input: 40 x 'a' + '!'   budget 1000 ms
+vulnerable   (?:(?:a+)+)+b    ABORTED after 1019 ms
+rewritten    a+b              0 ms  matches=false
+possessive   (?:a++)++b       7 ms  matches=false
+atomic       (?>(?:a+)+)b     0 ms  matches=false
+
+find() a+b        n=5000    139 ms  found=false
+find() a+b        n=10000   489 ms  found=false
+find() a+b        n=20000  1906 ms  found=false
+find() (?<!a)a+b  n=5000      6 ms  found=false
+find() (?<!a)a+b  n=10000     6 ms  found=false
+find() (?<!a)a+b  n=20000    15 ms  found=false