Email Regular Expression

Question

There is such a regular expression for checking Email:

pattern="^[A-Za-z0-9][A-Za-z0-9\.-_]*[A-Za-z0-9]*@([A-Za-z0-9]+([A-Za-z0-9-]*[A-Za-z0-9]+)*\.)+[A-Za-z]*$"

Tell me, please, why not skip:

my-email@ukr.net

In this case, my_email@ukr.net and my.email@ukr.net skips.

edem edem 4,700 2 12 35 · Accepted Answer · 2016-09-05T13:57:55

Because the hyphen also needs to be escaped with a backslash:

 pattern="^[A-Za-z0-9][A-Za-z0-9\.\-_]

Since in the current record \.-_ hyphen character is perceived as a range character, and not as one simple character.

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