StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
5503271
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
11
CommunityOwnedDate
CreationDate
2011-03-31T16:39:29.693
FavoriteCount
0
LastActivityDate
2011-03-31T17:24:40.347
LastEditDate
2011-03-31T17:24:40.347
LastEditorUserId
92313
OwnerUserId
92313
ParentId
5503206
PostTypeId
2
Score
32
ViewCount
0
LastEditorDisplayName
text
Body
It seems like you aren't really familiar with what your regex is doing currently, which would be a good first step before modifying it. Let's walk through your regex using the email address <code>john.robert.smith@mail.com</code> (in each section below, the bolded part is what is matched by that section): <ol> <li><code>^</code> is the <a href="http://www.regular-expressions.info/anchors.html">start of string anchor</a>. It specifies that any match must begin at the beginning of the string. If the pattern is not anchored, the regex engine can match a substring, which is often undesired. Anchors are zero-width, meaning that they do not capture any characters.</li> <li><code>[_a-z0-9-]+</code> is made up of two elements, a <a href="http://www.regular-expressions.info/charclass.html">character class</a> and a <a href="http://www.regular-expressions.info/repeat.html">repetition modifer</a>: <ul> <li><code>[...]</code> defines a character class, which tells the regex engine, any of these characters are valid matches. In this case the class contains the characters a-z, numbers 0-9 and the dash and underscore (in general, a dash in a character class defines a range, so you can use <code>a-z</code> instead of <code>abcdefghijklmnopqrstuvwxyz</code>; when given as the last character in the class, it acts as a literal dash).</li> <li><code>+</code> is a repetition modifier that specifies that the preceding token (in this case, the character class) can be repeated one or more times. There are two other repetition operators: <code>*</code> matches zero or more times; <code>?</code> matches exactly zero or one times (ie. makes something optional).</li> </ul> (captures john.robert.smith@mail.com)</li> <li><code>(\.[_a-z0-9-]+)*</code> again contains a repeated character class. It also contains a <a href="http://www.regular-expressions.info/brackets.html">group</a>, and an escaped character: <ul> <li><code>(...)</code> defines a group, which allows you to group multiple tokens together (in this case, the group will be repeated as a whole). Let's say we wanted to match 'abc', zero or more times (ie. abcabcabc matches, abcccc doesn't). If we tried to use the pattern <code>abc*</code>, the repetition modifier would only apply to the <code>c</code>, because c is the last token before the modifier. In order to get around this, we can group abc (<code>(abc)*</code>), in which case the modifier would apply to the entire group, as if it was a single token.</li> <li><code>\.</code> specifies a literal dot character. The reason this is needed is because <code>.</code> is a special character in regex, meaning <a href="http://www.regular-expressions.info/dot.html">any character</a>. Since we want to match an actual dot character, we need to escape it.</li> </ul> (captures john.robert.smith@mail.com)</li> <li><code>@</code> is not a special character in regex, so, like all other non-special characters, it matches literally. (captures john.robert.smith@mail.com)</li> <li><code>[a-z0-9-]+</code> again defines a repeated character class, like item #2 above. (captures john.robert.smith@mail.com)</li> <li><code>(\.[a-z0-9-]+)*</code> is almost exactly the same pattern as #3 above. (captures john.robert.smith@mail.com)</li> <li><code>$</code> is the end of string anchor. It works the same as <code>^</code> above, except matches the end of the string.</li> </ol> <hr> With that in mind, it should be a bit clearer how to add a section with captures a plus segment. As we saw above, <code>+</code> is a special character so it has to be escaped. Then, since the + has to be followed by some characters, we can define a character class with the characters we want to match and define its repetition. Finally, we should make the whole group optional because email addresses don't need to have a + segment: <pre><code>(\+[a-z0-9-]+)? </code></pre> When inserted into your regex, it'd look like this: <pre><code>/^[_a-z0-9-]+(\.[_a-z0-9-]+)*(\+[a-z0-9-]+)?@[a-z0-9-]+(\.[a-z0-9-]+)*$/i </code></pre>
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POAllow + in regex email validate email
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USDaniel Vandersluis
UserOwnerUserId
1. USDaniel Vandersluis
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. POAllow + in regex email validate email
 singulars
 PostTypePostTypeId
 PTQuestion
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTAcceptedByOriginator
2. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
3. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.