A regular expression is a string of characters used to create a search pattern.
With Regular Expression we can create more flexible definitions for things like view filters, goals, segments, audiences, content groups, and channel groupings.
|Some of the special characters used in regular expressions|
|$||A dollar sign signifies the end of the line.|
|^||A caret signifies the start of a line.|
||||A vertical pipe essentially means “or.”|
|.||A dot matches any single character|
|( )||Matches the enclosed characters in exact order anywhere in a string|
|[ ]||Matches the enclosed characters in any order anywhere in a string|
|–||Creates a range of characters within brackets to match anywhere in a string|
|+||Matches the preceding character 1 or more times|
|*||Matches the preceding character 0 or more times|
|?||Matches the preceding character 0 or 1 times|
|\||They turn special (RegEx) characters into normal characters.|