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Regex

NFA-based regular expression.

Build

Build with clang 3.4.

cmake -G "Unix Makefiles" && make

Syntax

The following syntax features have been supported.

Metacharacter Description
. Matches any single character exclude \n.
| Alternation, "abc|def" matches abc or def.
[ ] A bracket expression. Matches a single character that is contained within the brackets. For example, [abcx-z] matches a b c x y z.
[^ ] Matches a single character that is not contained within the brackets. For example, [^abc] matches any character other than a b c.
^ Matches the beginning of a line or string.
$ Matches the end of a line or string.
( ) Group a series of pattern elements and capture the match result.
(?:) Group a series of pattern elements, no capture.
? Matches the preceding pattern element zero or one times.
* Matches the preceding pattern element zero or more times.
+ Matches the preceding pattern element one or more times.
{m,n} Matches the preceding pattern element at least m and not more than n times. {3,5} matches 3 to 5 times, {3,} matches 3 or more times, {3} matches 3 times.
(?=) Group a series of pattern elements as prediction, matches not within the match result.
(?<=) Group a series of pattern elements as preceding prediction, matches not within the math result.
\b Matches a word boundary.
\B Matches boundary except word boundary.
\d Matches [0-9].
\D Matches [^0-9].
\f Matches \f.
\n Matches \n.
\r Matches \r.
\s Matches [\f\n\r\t\v].
\S Matches [^\f\n\r\t\v].
\t Matches \t.
\v Matches \v.
\w Matches [A-Za-z0-9_].
\W Matches [^A-Za-z0-9_].
Character classes ASCII Description
[:alnum:] [A-Z a-z 0-9] Alphanumeric characters
[:alpha:] [A-Z a-z] Alphabetic characters
[:blank:] [ \t] Space and tab
[:cntrl:] [\x00-\x1F\x7F] Control characters
[:digit:] [0-9] Digits
[:graph:] [\x21-\x7E] Visible characters
[:lower:] [a-z] Lowercase letters
[:print:] [\x20-\x7E] Visible characters and the space character
[:punct:] [][!"#$%&'()*+,./:;<=>?@\^_`{|}~-] Punctuation characters
[:space:] [ \t\r\n\v\f] Whitespace characters
[:upper:] [A-Z] Uppercase letters
[:word:] [A-Za-z0-9_] Alphanumeric characters plus "_"
[:xdigit:] [A-Fa-f0-9] Hexadecimal digits

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Simple regex library

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