add isSemver()

[tanpero]

No description provided.

[profnandaa]

LGTM for the most part. Please add the tests.

[tux-tn]

@tanpero @profnandaa lookbehind assertions have been added in ES2018 specification . The regex won't work on browsers/platforms not implementing ES2018.
I suggest using the regex provided by semver.org . They are even providing the test cases https://regex101.com/r/lLc0SL/1

^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$

[profnandaa]

@tanpero @profnandaa lookbehind assertions have been added in ES2018 specification . The regex won't work on browsers/platforms not implementing ES2018.
I suggest using the regex provided by semver.org . They are even providing the test cases https://regex101.com/r/lLc0SL/1

^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$

Thanks for the catch, Sarhan. @tanpero -- please address.

[AubreyHewes]

@tanpero done by #1246 ?

[profnandaa]

Sure.