CODEWITHSUNDEEP
javaregex
Khaled
Khaled

Reputation: 654

Meaning of ['_a-z0-9-\\+] Regex in Java

I was looking at the Struts 2 RegEx for email validation and was unclear on a subset of it. The regex as stated in https://struts.apache.org/docs/email-validator.html is as follows:

\\b^['_a-z0-9-\\+](\\.['_a-z0-9-\\+])@[a-z0-9-](\\.[a-z0-9-])\\.([a-z]{2}|aero|arpa|asia|biz|com|coop|edu|gov|info|int|jobs|mil|mobi|museum|name|nato|net|org|pro|tel|travel|xxx)$\\b

My question is regarding the part ['_a-z0-9-\\\\+].

I know that _a-z0-9 means either a letter from a-z, a number from 0-9, or an underscore. I am not sure what the single quotation mark before the underscore means, or what -\\\\+ before the closing square bracket means.

Upvotes: 0

Views: 315

Answers (1)

Eranda
Eranda

Reputation: 1467

It's just the ',-,+ character match in your string. ['_a-z0-9-\\+] means one of character match of ', a-z, 0-9,-, +.

Upvotes: 2

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