Matching Clauses in Regular Expressions
A list of various matching clauses in regular expressions with descriptions of their meanings and examples of their use.
Any digit from 0 to 9
\d\d matches 59, but not ab or 5a
Any character not a digit
\D\D\D matches abc, but not 123 or 12b
Any word character: A-Z, a-z, 0-9, and underscore "_"
\w\w\w\w matches 12a4, but not $123
Any non-word character
\W matches $, but not A
Any white space character, including tab, newline, carriage return, formfeed, and vertical tab
\s matches the tab character, but not A
Any non-white space character
\S matches A, but not the tab character
Any single character
. matches a, 1, and $
Any one of the characters between the brackets
abc matches a, b, or c a-z matches any character a through z
Any one character not between the brackets
abc matches any character except a, b, or c a-z matches any character except a through z
The NULL string at the start of a word.
The NULL string at the end of the word.
The NULL string at either the start or the end of a word.
A NULL string within a word.
This example looks for a telephone number. The area code must be enclosed in parentheses and there also must be a hyphen.
? regex_split("Our phone number is (781)229-4500.", "(\(\d\d\d\)\d\d\d-\d\d\d\d)") = "(781)229-4500"
This example looks for the area code telephone number.
? regex_split("Our phone number is (781)229-4500.", "(\(\w\w\w\))") = "(781)"
This example looks for value of a dollar amount. Note that the "\" before the period "." indicates that the period is the actual character being looked for.
? regex_split("the price is $123.45.", "(\d\d\d\.\d\d)") = "123.45"