On each line, in the leftmost column, you will find a new element of regex syntax. The tables are meant to serve as an accelerated regex course, and they are meant to be read slowly, one line at a time. With these tables as a jumping board, you will be able to advance to mastery by exploring the other pages on the site. I tried to introduce features in a logical order and to keep out oddities that I've never seen in actual use, such as the "bell character". If you are a complete beginner, you should get a firm grasp of basic regex syntax just by reading the examples in the tables. The other reason the tables are not exhaustive is that I wanted them to serve as a quick introduction to regex. NET) you may want to check once a year, as their creators often introduce new features. In fact, for some regex engines (such as Perl, PCRE, Java and.
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For a full reference to the particular regex flavors you'll be using, it's always best to go straight to the source. First, every regex flavor is different, and I didn't want to crowd the page with overly exotic syntax. The tables are not exhaustive, for two reasons. I encourage you to print the tables so you have a cheat sheet on your desk for quick reference. (It you want a bookmark, here's a direct link to the regex reference tables). While reading the rest of the site, when in doubt, you can always come back and look here. Matches either colour or color, because the ? makes the letter u optional.The tables below are a reference to basic regex. For example, the following regular expression: Matches punctuation characters and symbols: Matches visible characters only-that is, any characters except spaces, control characters, and so on. Note: This character class must be surrounded with another set of square brackets when you use it in a regular expression, for example: ]. Matches alphanumeric characters (letters or digits): Matches any character that’s not a letter from a to f Matches any character not in the set of characters. Note: Regular expressions in Content Compliance policies are case sensitive. Separate the first and last character in a set with a dash.
Matches any character from a set of characters. matches a literal period, rather than any character (dot character) Indicates that the next character is a literal rather than a special character.
(pipe) Indicates alternation-that is, an “or.” For example: (dot) Matches any single character, except a new line. For example, a content rule with a location Subject line and the following regular expression:Ĭaptures any email message that has a subject line ending with the letters xyz (dollar) Matches the end of the line or string of text that the regular expression is searching. For example, a content rule with a location Subject line and the following regular expression:Ĭaptures any email message that has a subject line beginning with the letters abc (caret) Matches the start of the line or string of text that the regular expression is searching. These characters are categorized as follows: Characters The following table describes some of the most common special characters for use in regular expressions. See also Configure Content Compliance settings For additional instructions and guidelines, see also Guidelines for Using Regular Expressions and Examples of Regular Expressions.
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