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reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;

what is the use of / operator
and ^ what does + used for
why \

please explain in depth

Thank u

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  • Latest Post Latest Post by farhan386
Member Avatar for farhan386

That's a Regular Expression (or RegEx in short). Every symbol has a meaning, \ for escaping a non-alphanumeric character, / mark the start of an expression, $ mean end of line, etc etc.

([A-Za-z0-9_\-\.])+
means I want alphanumeric character, or dash, or underscore, or dot, at least once.

\@([A-Za-z0-9_\-\.])+
means I want an @ sign followed by alphanumeric character, or dash, or underscore, or dot, at least once

\.([A-Za-z]{2,4})
means I want a dot sign, followed by alphabet for at least two and at most four characters.

You may want to take a short tutorial about it, regex will help you a lot in programming, not only for validating email.

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