Here is my string:

^((\S)([a-z]))[a-zA-Z0-9_ -.] @[a-zA-Z.-] \.(edu|com|edu7|org)$\b

I need to check for 2 conditions in the beginning of a string:

1. No space
2. No number

My string satisfies the first condition but fails the second condition. Thank you for any suggestions. I did try regex101 but could not solve it.

Here are two email addresses that are both invalid:

  [email protected]  
[email protected]  

I want neither of those returned by the program. My current code considers the second email as valid, which is incorrect.

CodePudding user response：

Your expected matches imply that you want to only allow letters as the first char in the string, so you can use

^[a-zA-Z][a-zA-Z0-9_ .-]*@[a-zA-Z.-] \.(?:edu7?|com|org)$

See the regex demo. Details:

• ^ - start of string
• [a-zA-Z] - an ASCII letter
• [a-zA-Z0-9_ .-]* - zero or more letters, digits, _, , . and - (note the position of the hyphen, it must be at the end of the character class)
• @ - a @ char
• [a-zA-Z.-] - one or more letters, dots or hyphens
• \. - a dot
• (?:edu7?|com|org) - edu, edu7, com, org
• $ - end of string.