Regex for custom validation

Question

Hello, I am looking to create a validation for a text entry. It is always 8 characters long, starting with a letter. However, it will either be one of the following:1 letter and 7 numbers (e.g., A1234567)	2 letters and 6 numbers (e.g., AB123456)	3 letters and 5 numbers (e.g., ABC12345)	4 letters and 4 numbers (e.g., ABCD1234)I tried a few options, but none seemed to work. Any help would be greatly appreciated! Thank you in advance.

chackbusch · Accepted Answer

@woodshTry this:^[A-Za-z]{1}[0-9]{7}$|^[A-Za-z]{2}[0-9]{6}$|^[A-Za-z]{3}[0-9]{5}$|^[A-Za-z]{4}[0-9]{4}$Some explanation:- `^[A-Za-z]{1}[0-9]{7}$` matches a string with 1 letter followed by 7 digits.- `^[A-Za-z]{2}[0-9]{6}$` matches a string with 2 letters followed by 6 digits.- `^[A-Za-z]{3}[0-9]{5}$` matches a string with 3 letters followed by 5 digits.- `^[A-Za-z]{4}[0-9]{4}$` matches a string with 4 letters followed by 4 digits.- The `|` operator denotes an OR condition, allowing any one of the four patterns to match.

woodsh · Answer

@woodshTry this:^[A-Za-z]{1}[0-9]{7}$|^[A-Za-z]{2}[0-9]{6}$|^[A-Za-z]{3}[0-9]{5}$|^[A-Za-z]{4}[0-9]{4}$Some explanation:- `^[A-Za-z]{1}[0-9]{7}$` matches a string with 1 letter followed by 7 digits.- `^[A-Za-z]{2}[0-9]{6}$` matches a string with 2 letters followed by 6 digits.- `^[A-Za-z]{3}[0-9]{5}$` matches a string with 3 letters followed by 5 digits.- `^[A-Za-z]{4}[0-9]{4}$` matches a string with 4 letters followed by 4 digits.- The `|` operator denotes an OR condition, allowing any one of the four patterns to match.Thank you for this! My testing is showing this worked. I really appreciate you explaining it. I was able to adapt it from your explanation to fix another one that was causing some issues!

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