Regular expression

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Regular expressions in rules for processing emails allow you to isolate a desired fragment of text when extracting data from an email.

Important

  • The use of regular expressions typically requires programming skills. If you don't know any programming languages, you should ask for help.


Formatting regular expressions

Planfix uses the regular expression format used in Java. The syntax of regular expressions uses the symbols <([{\^-=$!|]})?*+.>, which can be combined with letters to create metacharacters. The most frequently used metacharacters are listed in this table:

Metacharacter Meaning
^ beginning of input
$ end of input
\d digit
\D non-digit character
\s space character
\S non-space character
\w alphanumeric character or underscore
\W any character except alphanumerics and underscores
. any character
\t tab character
\n newline symbol
\r carriage return symbol
[abc] any of the characters listed (a, b, or c)
[^abc] any character except those listed (not a, b, or c)
[a-zA-Z] multiple ranges (Latin characters from A to Z, case-insensitive)
[a-d[m-p]] combining characters (from a to d and from m to p)
[a-z&&[def]] overlapping characters (d, e, f)
[a-z&&[^bc]] subtracting characters (a, d-z)
? one or not exist
* match zero or one
+ one or more times
{n} n times
{n,} n or more times
{n,m} at least n times and no more than m times



Helpful information

  • The result of text processing using a regular expression becomes the first capturing group. Accordingly, what is needed in the result should be enclosed in parentheses, and the rest of the groups should be made non-capturing (?:)



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