Why write different between RegEx in UIPath and in web regex

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The ability to test OS_Regex and OS_Match patterns in a real-time tester would make writing Wazuh Decoders and rules so much simpler,

เว็บ slot online Regular Expressions, abbreviated as Regex or Regexp, are a string of characters Learn regex online with examples and tutorials on RegexLearn now Start PHP Live Regex - A Live Regular Expression Tester for PHP — A Live Regular Expression Tester for PHP Tutorials and Regex Database Regex Regex Options  In uiPath use formular = + But If I use same formalar in web regex online , It show error as below

ลิงค์ ซองของขวัญ true wallet In uiPath use formular = + But If I use same formalar in web regex online , It show error as below