$ means “Match the end of the string ” (the position after the last character in the string). Both are called anchors and ensure that the entire string is matched instead of just a substring.
Read moreWhat does regex D mean?
\d (digit) matches any single digit (same as [0-9] ). The uppercase counterpart \D (non-digit) matches any single character that is not a digit (same as [^0-9] ).
Read moreIs MongoDB search case insensitive?
Mongo (current version 2.0. 0) doesn’t allow case-insensitive searches against indexed fields – see their documentation. For non-indexed fields, the regexes listed in the other answers should be fine.7 Kas 2011
Read moreAre MongoDB field names case sensitive?
A database with “” empty string is not a valid database name. Database name cannot be more than 64 bytes. Database name are case-sensitive , even on non-case-sensitive file systems. Thus it is good to keep name in lower case.
Read moreWhich of the following call to Preg_match will return false?
preg_match() returns 1 if the pattern matches given subject , 0 if it does not, or false on failure . This function may return Boolean false , but may also return a non-Boolean value which evaluates to false .
Read moreHow do you ignore case sensitive in regex?
If you want only part of the regex to be case insensitive (as my original answer presumed), then you have two options:
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