Ryszard Czech questions

Ryszard Czech answers

• Regex - starts with a particular string but does not end with another substring
• Regex for containing only alphanumeric characters and underscores, start with an alphabetic character
• Regex that allows PascalCased with one or more consecutive uppercase letters and numbers
• Regex: Decimal with constraints and certain alpha characters allowed at the end
• Error 'invalid regular expression '[:alpha:]+'' after migrating R and RStudio
• Why regular expression is stuck?
• python: insert comma delimiter between words that are stuck together in a string with regex
• Found non-literal argument to RegExp Constructor - Eslint issue
• Regex to find and expression and insert into the middle
• Regex - characters after delimiter, limited to a number