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Regular Expression
Test String
Substitution
DOI without hyphen-like hyphens
https://www.doi.org/doi_handbook/2_Numbering.html#2.9 recommands NOT using the hyphen-like characters that look (visually) like the character \u002D, but does not match with it. These characters sometimes (by accident) end up in DOI. Among them: \u058A \u2010 \u2011 \u2012 \u2013 \u2014 \u2015 \u301C \uFE58 \uFE63 \uFF0D A regular expression that will only match DOI's without them is: \b(10[.][0-9]{4,}(?:[.][0-9]+)*\/(?:(?!["&\'\u058A\u2010\u2011\u2012\u2013\u2014\u2015\u301C\uFE58\uFE63\uFF0D])\S)+)\b A generic regular expression that will match DOI's regardless of any undesired hyphen-like characters is: \b(10[.][0-9]{4,}(?:[.][0-9]+)*\/(?:(?!["&\'])\S)+)\b A regular expression that will match any string with one or more of the undesired hyphens is: [\u058A\u2010\u2011\u2012\u2013\u2014\u2015\u301C\uFE58\uFE63\uFF0D]+Comments
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Cheat Sheet
| Character classes | |
|---|---|
| . | any character except newline |
| \w \d \s | word, digit, whitespace |
| \W \D \S | not word, digit, whitespace |
| [abc] | any of a, b, or c |
| [^abc] | not a, b, or c |
| [a-g] | character between a & g |
| Anchors | |
| ^abc$ | start / end of the string |
| \b | word boundary |
| Escaped characters | |
| \. \* \\ | escaped special characters |
| \t \n \r | tab, linefeed, carriage return |
| \u00A9 | unicode escaped © |
| Groups & Lookaround | |
| (abc) | capture group |
| \1 | backreference to group #1 |
| (?:abc) | non-capturing group |
| (?=abc) | positive lookahead |
| (?!abc) | negative lookahead |
| Quantifiers & Alternation | |
| a* a+ a? | 0 or more, 1 or more, 0 or 1 |
| a{5} a{2,} | exactly five, two or more |
| a{1,3} | between one & three |
| a+? a{2,}? | match as few as possible |
| ab|cd | match ab or cd |
