Create a regex pattern that can accurately extract email addresses from a comma-del

Question

Create a regex pattern that can accurately extract email addresses from a comma-del

Currently, I have a regular expression that validates a single email address. How can I modify this regex to accept a list of email addresses separated by commas?

^(([A-Za-z0-9]+_+)|([A-Za-z0-9]+\-+)|([A-Za-z0-9]+\.+)|([A-Za-z0-9]+\++))*[A-Za-z0-9]+@((\w+\-+)|(\w+\.))*\w{1,63}\.[a-zA-Z]{2,6}$

In my razor view, I am inserting the regex within an input tag:

<input data-val="true" data-val-length="Email field exceeds maximum length of 50" data-val-length-max="50" data-val-regex="Email-Address is invalid" data-val-regex-pattern="^(([A-Za-z0-9]+_+)|([A-Za-z0-9]+\-+)|([A-Za-z0-9]+\.+)|([A-Za-z0-9]+\++))*[A-Za-z0-9]+@((\w+\-+)|(\w+\.))*\w{1,63}\.[a-zA-Z]{2,6}$" id="Email" name="Email" type="text" value="">

javascript c#asp.net regex razor

Answer 1

Answer №1

When dealing with a list of interior optional items separated by commas, the usual approach is to use this pattern:
(?:my regex)(?:,my regex)*

# ^(?:[A-Za-z0-9]+[_.+-]+)*[A-Za-z0-9]+@(?:\w+[.-]+)*\w{1,63}\.[a-zA-Z]{2,6}(?:,(?:[A-Za-z0-9]+[_.+-]+)*[A-Za-z0-9]+@(?:\w+[.-]+)*\w{1,63}\.[a-zA-Z]{2,6})*$

^
(?:[A-Za-z0-9]+[_.+-]+)*[A-Za-z0-9]+
@
(?:\w+[.-]+)*\w{1,63}\.[a-zA-Z]{2,6}
(?:
     ,
     (?:[A-Za-z0-9]+[_.+-]+)*[A-Za-z0-9]+
     @
     (?:\w+[.-]+)*\w{1,63}\.[a-zA-Z]{2,6}
)*
$

Answer 2

When dealing with a list of interior optional items separated by commas, the usual approach is to use this pattern:
(?:my regex)(?:,my regex)*

# ^(?:[A-Za-z0-9]+[_.+-]+)*[A-Za-z0-9]+@(?:\w+[.-]+)*\w{1,63}\.[a-zA-Z]{2,6}(?:,(?:[A-Za-z0-9]+[_.+-]+)*[A-Za-z0-9]+@(?:\w+[.-]+)*\w{1,63}\.[a-zA-Z]{2,6})*$

^
(?:[A-Za-z0-9]+[_.+-]+)*[A-Za-z0-9]+
@
(?:\w+[.-]+)*\w{1,63}\.[a-zA-Z]{2,6}
(?:
     ,
     (?:[A-Za-z0-9]+[_.+-]+)*[A-Za-z0-9]+
     @
     (?:\w+[.-]+)*\w{1,63}\.[a-zA-Z]{2,6}
)*
$

Create a regex pattern that can accurately extract email addresses from a comma-del

Answer №1

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