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@ -470,29 +470,6 @@ line. And because of `m` flag now regular expression engine matches pattern at t
[Test the regular expression](https://regex101.com/r/E88WE2/1)
## Bonus
* *Positive Integers*: `^\d+$`
* *Negative Integers*: `^-\d+$`
* *US Phone Number*: `^+?[\d\s]{3,}$`
* *US Phone with code*: `^+?[\d\s]+(?[\d\s]{10,}$`
* *Integers*: `^-?\d+$`
* *Username*: `^[\w.]{4,16}$`
* *Alpha-numeric characters*: `^[a-zA-Z0-9]*$`
* *Alpha-numeric characters with spaces*: `^[a-zA-Z0-9 ]*$`
* *Password*: `^(?=^.{6,}$)((?=.*[A-Za-z0-9])(?=.*[A-Z])(?=.*[a-z]))^.*$`
* *email*: `^([a-zA-Z0-9._%-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,})*$`
* *IPv4 address*: `^((?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))*$`
* *Lowercase letters only*: `^([a-z])*$`
* *Uppercase letters only*: `^([A-Z])*$`
* *URL*: `^(((http|https|ftp):\/\/)?([[a-zA-Z0-9]\-\.])+(\.)([[a-zA-Z0-9]]){2,4}([[a-zA-Z0-9]\/+=%&_\.~?\-]*))*$`
* *VISA credit card numbers*: `^(4[0-9]{12}(?:[0-9]{3})?)*$`
* *Date (DD/MM/YYYY)*: `^(0?[1-9]|[12][0-9]|3[01])[- /.](0?[1-9]|1[012])[- /.](19|20)?[0-9]{2}$`
* *Date (MM/DD/YYYY)*: `^(0?[1-9]|1[012])[- /.](0?[1-9]|[12][0-9]|3[01])[- /.](19|20)?[0-9]{2}$`
* *Date (YYYY/MM/DD)*: `^(19|20)?[0-9]{2}[- /.](0?[1-9]|1[012])[- /.](0?[1-9]|[12][0-9]|3[01])$`
* *MasterCard credit card numbers*: `^(5[1-5][0-9]{14})*$`
* *Hashtags*: Including hashtags with preceding text (abc123#xyz456) or containing white spaces within square brackets (#[foo bar]) : `\S*#(?:\[[^\]]+\]|\S+)`
* *@mentions*: `\B@[a-z0-9_-]+`
## Contribution
* Report issues