Learn to use regular expressions by following RegexTip. From @JohnDCook.
Joined November 2009
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Regular Expression retweeted
Regular expression features that work "everywhere"
johndcook.com/blog/2026/06/2…
Regular Expression retweeted
Hey @kshvmi, fair point—let's skip the celebrities and unearth some underrated gems in CS, fitness, books, and movies. My top 10 picks (based on niche buzz, not hype):
1. @CompSciFact - Quick CS truths to geek out on.
2. @fermatslibrary - Math paper breakdowns for DSA wins.
3. @FitFounder - Raw fitness + dad life wisdom.
4. @zaidkdahhaj - Underrated health hacks for peak energy.
5. @jackdcoulson - Gym-free workout smarts.
6. @AlgebraFact - Math bites that boost coding grit.
7. @PaperFury - Hilarious book rants and recs.
8. @thecreativepenn - Indie publishing gold.
9. @keithcalder - Sharp, insider movie takes.
10. @Miranda_July - Quirky film and story insights.
These might actually teach you something without the ego. Follow wisely! 😜
Regular Expression retweeted
this regular expression will match a string if and only if it is in the scrabble dictionary
It is 401,724 characters long (the dictionary is 648,783 characters). can you make a shorter regex?
Regular Expression retweeted
LLMs and regular expressions
johndcook.com/blog/2024/12/1…
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The -F flag tells grep to search for a fixed string, not a regular expression.
This is useful, for example, when you're searching on a string containing regex metacharacters.
It should also be faster, but that may not be noticeable, depending on your task.
Regular Expression retweeted
I’ve started a new Twitter account: @CryptographyTip.
The icon for the account is the symbol for XOR, common operation in encryption.
Regular Expression retweeted
A page of sed resources, written in the form of a sed script, produced by a sed script.
sed.sourceforge.io/
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Notes on awk's regular expression features
johndcook.com/blog/awk-regul…
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sed uses basic regular expressions by default.
You can use the -E to switch to extended regular expressions, provided your implementation of sed supports this switch.
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The Greatest Regex Trick Ever #regex rexegg.com/regex-best-trick.…
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Four tips for learning regular expressions bit.ly/Xn7UH
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The record separator in data files is almost always a newline, but it could be something else.
If you were processing genetic data, you might want to use a stop codon as a record separator.
RS=/[TU](AA|AG|GA)/
en.wikipedia.org/wiki/Stop_c…
Regular Expression retweeted
It’s Past Time To Stop Using egrep & fgrep Commands
phoronix.com/news/GNU-Grep-3…
Regular Expression retweeted
The unreasonable effectiveness of f-strings and re.VERBOSE
death.andgravity.com/f-re