[lworld] RFR: 8378365: [lworld] Replace use of regular expression in ExplodedImage [v3]

[David Beaumont]

> Fixes regex related issue before migration of ExplodedImage changes into mainline.
> 
> Test already present for "bad" paths in:
> test/jdk/jdk/internal/jrtfs/SystemImageTest.java
> but I will add a few more.

David Beaumont has updated the pull request incrementally with two additional commits since the last revision:

 - tidy unwanted auto-format
 - tidy unwanted auto-format

-------------

Changes:
  - all: https://git.openjdk.org/valhalla/pull/2147/files
  - new: https://git.openjdk.org/valhalla/pull/2147/files/0fbf2990..7668df0e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=2147&range=02
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=2147&range=01-02

  Stats: 8 lines in 1 file changed: 0 ins; 4 del; 4 mod
  Patch: https://git.openjdk.org/valhalla/pull/2147.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2147/head:pull/2147

PR: https://git.openjdk.org/valhalla/pull/2147