Regex Pal

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github.com/TryGhost/Ghost/pull/9762

https://github.com/TryGhost/Ghost/pull/9762/files#diff-e7b88060df0e3026e0ea24c3b5b4671cR22 Current PR - line 22: previewPattern = new RegExp('^\\/p\\/'); Proposed Solution with RegEx Tester: previewPattern = new RegExp('p\/\/*.*');

Comments

Top Regular Expressions

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