Question:
Explain this regex used in RoR /\A([^@\s]+)@((?:[-a-z0-9]+.)+[a-z]{2,})\Z/i What does the \A tag do ?
Solution:1
The \A and \Z markers are meant to provide a way to identify the start and end of a string, primarily for multi-line strings.
If you're processing one line at a time (which is mostly, but not completely, the case with UNIXy text processing tools), you could simply use ^ and $ because start/end of string is the same as start/end of line.
For example, the single string:
This is line 1 and this is line 2 would have two matches for ^, one before This and one between 1 and and. It would only have one match for \A, before This.
Solution:2
Start of a string.
See the "Permanent Start of String and End of String Anchors" section
Solution:3
As Chris Diver said, start of a string.
You can experiment with Regular Expressions at http://rubular.com.
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