The design is very human
The design is very human
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15 comments
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tbf regular expressions suck
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How so? I have been getting much more comfortable with it lately, but I am curious what downsides there are
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The downsides are having to relearn it every time you need to understand it.
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Just use something like https://regex101.com/
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not really i just meant they suck to remember how to write without looking up :)
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Here is my cheatsheet that has been very helpful. Obviously, this will not teach you how RegEx works, but is a good quick reference when I forget the exact syntax for something.
RegExp
Character classes
Pattern Description .Any character, except newline \wWord \dDigit \sWhitespace \WNot word \DNot digit \SNot whitespace [abc]Any of a, b, or c [a-e]Characters between aande[1-9]Digit between 1and9[[:print:]]Any printable character including spaces [^abc]Any character except a,borcAnchors
Pattern Description \GStart of match ^Start of string $End of string \AStart of string \ZEnd of string \zAbsolute end of string \bA word boundary \BNon-word boundary ^abcStart with abcabc$End with abcFor multiline patterns (
mflag),^and$will act as start and end of line.Escaped characters
Pattern Description \. \* \\Escape special character used by regex \tTab \nNewline \rCarriage return Groups
Pattern Description (abc)Capture group (a|b)Match aorb(?:abc)Match abc, but don't capture\1Substituted with text matched of the 1st capturing group Quantifiers
Pattern Description a*Match 0 or more a+Match 1 or more a?Match 0 or 1 a{5}Match exactly 5 a{,3}Match up to 3 a{3,}Match 3 or more a{1,3}Match between 1 and 3 Lookahead & Lookbehind
Pattern Description a(?=b)Match ainbabybut not inbaya(?!b)Match ainStanbut not inStab(?<=a)bMatch bincrabsbut not incribs(?<!a)bMatch binfibbut not infab(?<![a-z])abc(?![a-z])Match abcwithout any letters before/after
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Plus most drop downs allow you to type anyway from memory.
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15 comments