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Angular Validator Pattern works in HTML but not in TypeScript

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Following Regular Expression does work in HTML like following example: But if I want to put that pattern in the FormGroup, the Validator isn't recognized: mgmtIP: [host.mgmtIP, [ Validators.required, Validators.pattern(/^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.([01]?\\d\\d?|2[0-4]\\d|25[0-5])$/) ]], I tried putting it in a string with taking away the ^ and the $. That didn't work neither JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

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OK, I found the answer for this question. I was just stupid: I had an initial form with the validators in the form array. Then I have pushed some new formgroups in there, where these validators weren't configured. Thanks for your help anyway!

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