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StringReplace["hello, this is silly", x_ ~~ x_ -> x ~~ "X"] "helXo, this is silXy"

The problem arises from naming the inner sub-patterns in your two pattern definitions with the same identifier. When you combine the patterns with Alternatives, you then have a pattern with two sub-pa …

I think you should look at WordData. WordData["hyphenation", "Hyphenation"] {"hy", "phen", "a", "tion"} The definition of what is a syllable in English is tricky. The algorithm used by WordDat …

f[x_] := x^3 + x^2 + 1 Create a text cell containing: $\qquad$The value of this function at 7 is N[f[7]] Select N[f[7]] in the cell Choose Evaluate in Place from the Evaluation menu or that operat …

A brute force but very simple approach (no undocumented functions needed) that I think will work with any version of Mathematica. ordinalRule[n_Integer /; Mod[n, 100] == 11] := generalRule[n] ordinal …

This is a pretty ugly hack, but maybe it will inspire you to something better. leastCJK = ToCharacterCode["⺀"][[1]]; StringMatchQ[#, _?(ToCharacterCode[#][[1]] < leastCJK &)] & /@ {"a", "1", ".", …

Although I very much in favor of aardvark2012's answer using Pick, I would like to note that this can done with good old Table. data = {{"a", "b 3", "cd", "ef 23"}, {"z 12", "y", "x"}, {"z", "y"}, {" …

The following works for your example. But I am not sure that it will work for you if your example is not descriptive enough for some more general situation you have in mind. lis = {"a", "1", "b", "2" …

Position has some unusual defaults. As ref/Position says The default level specification for Position is {0,Infinity}, with Heads->True. So it is a little tricky to use StringContainsQ directly …

I ran into this problem in 2009. I submitted it to WRI technical support. This is the reply I received. After going through your notebook, I believe that what you observed is the expected behavi …

There is a reason to use WordBoundary, but your example sentence doesn't bring it out. Consider mystring = "I am a demanding fan of Superman, Spiderman and Batman."; StringCases[mystring, LetterChar …

It looks to me that when you copied you copied the plain text form not the input form of the list of strings representing your hexadecimal numbers. Normally, copying form output cells gives the input …

This is a minor variation on the last example in the Examples > Generalizations & Extensions section of RegularExpression, StringCases["big bad wolf", RegularExpression["(.*) .* (.*)"] -> {"$1", "$2" …

You can use Shortest if the sub-strings of the form <td, class=test, >...</td> don't contain nested sub-strings of the form <td, class=test, > or </td>. If they do, follow this link. v = "...<td, cl …

It seems that a simple modification of your code will work. fileList[prefix_String, m_Integer, n_Integer] := With[{dash = "-"}, prefix <> dash <> ToString[#] <> dash <> ToString[n] <> ".asc"] …