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Contentful regex to check if all characters are lowercase

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I know there a 1,000,000 regex questions but I have one I've been unable to find the answer too

In contentful (a headless CMS software) you can set validations for certain fields

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Now I have set this regex [a-z]+ to check if the string provided in this field is all lowercase letters (numbers and symbols are ok), but when I test it out, I am still allowed to use Capital letters.

Is my regex wrong? Or am I entering it wrong in this field??

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