Add static isValid function to CronExpression#165

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loneregister wants to merge 3 commits intodragonmantank:masterfrom loneregister:master

+27-11

Commits on Dec 20, 2019

Marked package as abandoned in composer.json
dragonmantank
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Commits on Sep 5, 2023

Add isValid static function to test expressions before use. (and use during as well)
loneregister
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Merge remote-tracking branch 'origin/master'
loneregister
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