Regex Light
Acknowledgement
The implementation of regex_light started from this great article: https://www.cs.princeton.edu/courses/archive/spr09/cos333/beautiful.html
Features
(): You can make parenthesized groups for backward reference- Small and fast
- Portablity: Similar API to stdlib's regex
$Lang
- C.ASCII
Types
- regex_t
- regmatch_t
Functions
- regcomp() # the 3rd arg will be ignored
- regexec()
- regfree()
Expressions
- any literal character
.... any single character^... beginning of the input$... end of the input*... zero or more of previous character+... one or more of previous character?... zero or one of previous character[-]... specified characters, between the two characters()... group for backward reference in regmatch_t\.\^\$\*\+\?\[\(... escape special characters treating them literals
Expressions which don't work
()*()+()?... but I want to make them work(|)... group OR group\1\2... backreference in pattern
Known issues
assert_match("[-a]", "-", 1, "-");
assert_match("[a-]", "-", 1, "-");
assert_match("((ab)cd)e", "abcde", 3, "abcde", "abcd", "ab"); // can not handle nested PAREN
assert_match("(ab)?c", "c", 2, "c", ""); // ()? doesn't work
assert_match("(ab)*c", "abababc", 2, "abababc", "ab"); // ()* doesn't work
assert_match("(ab)+c", "abababc", 2, "abababc", "ab"); // ()+ doesn't work