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Table A-27: Some Regular Expression Examples
Regular Expression Matches Does Not Match
/\bten\b/ ten attention, tensile,
often
/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/ 128.22.45.1 abc.44.55.42,
128.22.45.
/^(http|ftp|https):\/\/.*/ https://www.w3c.org,http://abc file:///etc/motd,
https//www.w3c.org
We summarize the important flags, repetition indicators, escape codes, and related object
properties of regular expressions in Tables A-28 through A-33. See Chapter 8 for a detailed
discussion.
Table A-28: Regular Expression Flags
Character Meaning
i Case-insensitive.
g Global match. Find all matches in the string, rather than just the first.
m Multiline matching.
Table A-29: Regular Expression Repetition Quantifiers
Character Meaning
* Match previous item zero or more times
+ Match previous item one time or more
? Match previous item zero or one times
{m, n} Match previous item at minimum m times, but no more than n times
{m, } Match previous item m or more times
{m} Match previous item exactly m times
Table A-30: Regular Expression Character Classes
Character Meaning
[chars] Any one character indicated either explicitly or as a range between the
brackets
[^chars] Any one character not between the brackets represented explicitly or as a
range
. Any character except newline
\w Any word character. Same as [a-zA-Z0-9_]
\W Any non-word character. Same as [^a-zA-Z0-9_]
\s Any whitespace character. Same as [ \t\n\r\f\v]
\S Any non-whitespace character. Same as [^ \t\n\r\f\v]
\d Any digit. Same as [0-9]