Use APIs that don't compile a Pattern each call

[alzimmermsft]

Use APIs that don't compile a Pattern on each call (String.replaceAll, String.replaceFirst, String.split [when split String is > 1 character]). Uncertain if the changed code is in a hot path but the overall reduction of using Pattern.compile should improve performance a good deal.

[kushagraThapar]

LGTM, thanks a lot @alzimmermsft - worth running full live CI on this PR.
Wondering, how did you find these string pattern issues ?

[alzimmermsft]

/azp run java - cosmos - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[alzimmermsft]

Wondering, how did you find these string pattern issues ?

Just prior experience with doing performance improvements in azure-core and reading through source code for Java versions. It's possible that different JVMs implement the methods slightly differently but if we can develop against it the better.

http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/java/lang/String.java#l2164
http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/java/lang/String.java#l2209
http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/java/lang/String.java#l2316

[alzimmermsft]

/azp run java - cosmos - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).