express: recognize regex with flags

[tlhunter]

What does this PR do?

• when determining if an express route is a regex, ensure we work when modifier flags are set
• so now we're just looking for the start of a regex pattern anywhere in the path (and not looking for an end)

Motivation

• fixes Regex matching doesn't account for case insensitivity pattern #3245

[github-actions]

Overall package size

Self size: 4.69 MB
Deduped: 61.15 MB
No deduping: 61.2 MB

Dependency sizes

name	version	self size	total size
@datadog/pprof	2.2.3	14.25 MB	15.13 MB
@datadog/native-iast-taint-tracking	1.5.0	14.86 MB	14.86 MB
@datadog/native-appsec	3.2.0	13.38 MB	13.39 MB
protobufjs	7.1.2	2.76 MB	6.55 MB
@datadog/native-iast-rewriter	2.0.1	2.09 MB	2.1 MB
@opentelemetry/core	1.14.0	872.87 kB	1.47 MB
@datadog/native-metrics	2.0.0	898.77 kB	1.3 MB
@opentelemetry/api	1.4.1	780.32 kB	780.32 kB
opentracing	0.14.7	194.81 kB	194.81 kB
semver	7.5.3	93.39 kB	123.79 kB
@datadog/sketches-js	2.1.0	109.9 kB	109.9 kB
lodash.sortby	4.7.0	75.76 kB	75.76 kB
lru-cache	7.14.0	74.95 kB	74.95 kB
ipaddr.js	2.0.1	59.52 kB	59.52 kB
ignore	5.2.0	48.87 kB	48.87 kB
import-in-the-middle	1.3.5	34.34 kB	38.81 kB
istanbul-lib-coverage	3.2.0	29.34 kB	29.34 kB
retry	0.10.1	27.44 kB	27.44 kB
lodash.uniq	4.5.0	25.01 kB	25.01 kB
limiter	1.1.5	23.17 kB	23.17 kB
lodash.kebabcase	4.1.1	17.75 kB	17.75 kB
lodash.pick	4.4.0	16.33 kB	16.33 kB
node-abort-controller	3.0.1	14.33 kB	14.33 kB
crypto-randomuuid	1.0.0	11.18 kB	11.18 kB
diagnostics_channel	1.1.0	7.07 kB	7.07 kB
path-to-regexp	0.1.7	6.78 kB	6.78 kB
koalas	1.0.2	6.47 kB	6.47 kB
methods	1.1.2	5.29 kB	5.29 kB
module-details-from-path	1.0.3	4.47 kB	4.47 kB

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[codecov]

Codecov Report

Merging #3301 (c0541d3) into master (27e1530) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3301   +/-   ##
=======================================
  Coverage   85.88%   85.88%           
=======================================
  Files         199      199           
  Lines        7692     7692           
  Branches       33       33           
=======================================
  Hits         6606     6606           
  Misses       1086     1086           

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[pr-commenter]

Benchmarks

Comparing candidate commit c0541d3 in PR branch tlhunter/express-route-regex-flags with baseline commit 27e1530 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 467 metrics, 25 unstable metrics.

[tommyksander]

thank you, @tlhunter!