What’s a Number? I have a simple question for your “simple” question: What precisely do you mean by “a number”? Is −0 a number? How do you feel about √−1? Is ⅝ or ⅔ a number? Is 186,282.42±0.02 miles/second one number — or is it two or three of them? Is 6.02e23 a number? Is 3.141_592_653_58...

UPDATE Since the poster requested a single regex that matches against strings like "36/270", but says it doesn’t matter how legible it is, that regex is: my $reducible_rx = qr{^(\d+)/(\d+)$(?(?{(1x$1."/".1x$2)=~m{^(?|1+/(1)|(11+)\1*/\1+)$}})|^)}; But, if like me, you believe that an illegible...

You can probably type faster than you can clean up images and install OCR engines: #!/usr/bin/perl (my$d=q[AA GTCAGTTCCT CGCTATGTA ACACACACCA TTTGTGAGT ATGTAACATA CTCGCTGGC TATGTCAGAC AGATTGATC GATCGATAGA ...

Pure Regex Solution perl -E'say for&{sub{"\U\x{fb01}\x{fb03}"=~/.{0,2}.{0,3}.{0,3}.{0,4}+(?{$_[++$#_]=rand})(*FAIL)/||pop;@_}}' Double‐/e Regex Solution This: ($_=(120.44.32)x(2+2*2**2)**2)=~s/\170/114.97.110.100/gee; s/(.*)/64.95.61.40.$1.41.35.89.65.78.69.84.85.84/ee; print "@_\n"; ...

Referring to a sentence from an online magazine: "Lonely Planet was started in 1975, when the British hippie husband-and-wife team Maureen and Tony Wheeler self-published a guide to cheap travel in Southeast Asia." I have noticed that in other resources also: that "husband-and-wife" team is use...

Some words are written without hyphens (nonaggression, nonbeliever), and some words are written with a hyphen (well-intentioned). Is there a schema in the use of a hyphen?

I can't figure out how to construct a regex for the example values: 123,456,789 -12,34 1234 -8 Could you help me?

Referring to a sentence from an online magazine: "Lonely Planet was started in 1975, when the British hippie husband-and-wife team Maureen and Tony Wheeler self-published a guide to cheap travel in Southeast Asia." I have noticed that in other resources also: that "husband-and-wife" team is use...

Pattern Recursion With recursive patterns, you have a form of recursive descent matching. This is fine for a variety of problems, but once you want to actually do recursive descent parsing, you need to insert capture groups here and there, and it is awkward to recover the full parse structure ...

Denial‐of‐Service Concerns The most common concern with regexes is a denial‐of‐service attack through pathological patterns that go exponential — or even super‐exponential! — and so appear to take forever to solve. These may only show up on particular input data, but one can generally create one...

All these answers claiming you can't use patterns to match a string with balanced nested parens are quite wrong. It's not practical to pretend that the patterns matched by modern programming languages are restricted to "regular languages" in the pathological textbook sense. As soon as you permi...

If you are guaranteed to have well-formed data consisting of nothing else but a singleton date in the DD-MM-YYYY format, then this works: # FIRST METHOD my $ndate = join("-" => reverse split(m[/], $date)); That works on a $date holding "07/04/1776" but fails on "this 17/01/2010 and that 01/...

Is there anyone out there who likes the phrase "as it were" and fancies their self a practiced and successful user of this phrase? If so, hit me up with some example sentences, or hey(!) even passages(!) in which you use this phrase. Much appreciated, thanks!