Questions on the manipulation of String objects in Mathematica, and the functions used for these manipulations.

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24
votes
4answers
1k views

What is the fastest way to count square-free words?

Background A word is a string of letters in an alphabet. A square-free word has no adjacent repeating substring. For example, (in the ternary alphabet of {0,1,2}) the words 00, 012121, and 0212012021 ...
5
votes
5answers
512 views

Extracting columns of text from a rectangular string

I have very large rectangular strings (on the order of 30-100 MB in size), which I import into Mathematica from text files using a command like ...
15
votes
3answers
476 views

Grabbing a number of characters around a string pattern

If I have some string data: text = StringTake[ExampleData[{"Text", "DeclarationOfIndependence"}], 400] "When in the Course of human events, it becomes ...
12
votes
3answers
838 views

Specifying string patterns in DeleteCases

It seems that DeleteCases is not compatible with string patterns, at least directly (see, for example, this question). Is this true? If so, why is this the case? ...
3
votes
3answers
129 views

Using NumberString, DigitCharacter, or a similar directive to find all string representations of integers in a string

I have a text file containing many, many lines of text like test in the following: ...
3
votes
5answers
361 views

How to extract strings from the list with an additional condition on previous elements?

There are a long list of strings $s$ and two lists of substrings $s1$ and $s2$. I want to take all elements of $s$ which contain a substring from $s2$ and such that before it on no more than $n$ ...
11
votes
7answers
246 views

DateList coupled with String Operations

Through some webscraping, I have the following list: ...
5
votes
3answers
181 views

DateList's aggressive interpretation of TimeML duration codes

DateList "aggressively" interprets strings, such as "p72h": DateList["p72h"] gives ...
5
votes
1answer
507 views

import complete date string to mathematica

Based on an example from here I try to parse dates from a table including the time, but it fails. This is the modified example: ...
5
votes
4answers
963 views

Creating lists from a string, separating words from numbers

Say I have a string that contains numbers and words, such as this one: string = "there are 1234 words and numbers 5678 in here $999"; How would I separate the ...
5
votes
3answers
430 views

Highlighting text with StringReplacePart but also using Style, Subscript

For a Natural Language Processing analysis task it's desirable to highlight a text string programmatically according to XML tags that reference specific words or phrases. The XML tags specify the ...
13
votes
2answers
476 views

Should I use \\\“ or \” to match " in regex?

Both of the following return True: ...
3
votes
6answers
2k views

Getting a String from a list of strings

Is there a way to write down Mathematica with a string such as: {"M","a","t","h","e","m","a","t","i","c","a"}?
6
votes
2answers
335 views

Formatting text through pattern matching

I am trying to format some text based on some patterns. ...
20
votes
2answers
2k views

How do I perform string matching and replacements?

What are, and how do I use Mathematica's string matching and replacement tools?
3
votes
4answers
266 views

Remove anything between () except for ; in a string

A simple question but I can't find the answer. I'm scanning a huge pile of mails and would like to get rid of anything between () in the email adresses since this normally contains just info that ...
6
votes
2answers
321 views

How to choose variables from a list for a function and then use the solution in a subsequent function?

I am trying to calculate heating degree days and cooling degree days and output that information to a table. I am using mathematica's curated data to do this. In text this is what I would like to ...
29
votes
4answers
4k views

Looking for “Longest Common Substring” solution

I'm looking for robust code to solve the "Longest Common Substring" problem: Find the longest string (or strings) that is a substring (or are substrings) of two or more strings. I can just code it ...
9
votes
1answer
264 views

Creating a version of SequenceAlignment that accepts patterns

SequenceAlignment seems like a function that is not (yet?) fully integrated into Mathematica. I want a function that accepts general patterns instead. I ...
29
votes
6answers
843 views

Partition string into chunks

This seems like it should be trivial, but how do I partition a string into length n substrings? I can of course write something like ...
11
votes
2answers
246 views

Pasting “rectangles” of text side-by-side

In Emacs/Xemacs, there is a rectangle feature, such that you can delete, copy, etc., "rectangles" of text. Now suppose I have two text files, each containing one column of numbers. Is it possible to ...
9
votes
2answers
561 views

Keeping Quotation Marks in Output

I am running into the following seemingly simple problem. I have this code: testphrase="i love you"; input=ToLowerCase[StringSplit[testphrase, Whitespace]] It ...
18
votes
1answer
573 views

NotebookFind and String Pattern Expressions

Is there a way that NotebookFind can be used to match string pattern expressions rather than just strings? The documentation for ...
22
votes
2answers
5k views

How to import all files of a folder at once?

I know how to import one textfile by calling its name filestring = Import["myfile.tex", "Text"]; Then "filestring" is a string with the myfile content. How do ...
5
votes
3answers
480 views

Thousands separator (comma) option for NumberString/StringCases?

I've been looking for a way to read numbers that have thousands separators in them: StringCases[" 1142.123 ", Whitespace ~~ NumberString ~~ Whitespace, 1] gives ...
17
votes
4answers
1k views

Finding all dictionary words that can be made with a given set of characters (Wordfeud/Scrabble)

This is a slightly more involved variant of this recent question. By sheer coincidence I happened to have been building a Wordfeud (Scrabble clone) game in Mathematica. My interactive Wordfeud ...
9
votes
2answers
270 views

Behavior of ImportString in Mathematica

I tried the following commands ...
7
votes
3answers
717 views

Creating word histograms from lists of strings

Consider the following: ...
6
votes
3answers
1k views

print the name of the variable in a list without evaluation

a := az + 1 b := bz + 5 list := {a, b} I'd like mathematica to print a = az + 1 b = bz + 5 so basically it needs to first ...
14
votes
8answers
1k views

DeleteCases on list of Strings

Consider the following: data={"AB","CD","AF"}; Now I would like to delete all String from data which starts with "A". ...
5
votes
2answers
475 views

Custom distance metric for agglomerative clustering in Mathematica

Is it possible to have a custom distance metric defined to determine the distance between two clusters in Agglomerative clustering in Mathematica? I have a 3 dimension data with string values along ...
6
votes
1answer
355 views

Interpreting text entry and splitting it in a Manipulate text field?

I have the following program that plots the number of trigram appearances across a corpus of textual information between 1964 and 1989 (apologies for the messy code): ...
13
votes
6answers
333 views

How can I mix the behaviors of StringReplace and ReplaceAll in a single rule?

I'm trying to take a list of the form { {"65 + 3 months", 75}, {"65 + 4 months", 75.1} }, and transform the string part to a number such as 65.25 or 65.333, ...
12
votes
2answers
396 views

Split a Unicode string maintaining uppercase characters

I want to split a string according to a predefined set of substrings (lowercase), though the actual text can contain uppercase characters anyplace. The task is to find the matches, longer preferred ...
17
votes
3answers
580 views

Unicode-aware string functions?

I've recently discovered that ToUpperCase is quite unreliable on non-ASCII input: ...
-2
votes
1answer
248 views

How to set a rule in pattern matching to change a string from one form to another

I want to define a rule that will change a particular type of string to another form. For example:- a string having ...
26
votes
7answers
1k views

Splitting words into specific fragments

I am looking into splitting words into a succession of chemical elements symbols, where possible. For example: Titanic = Ti Ta Ni C (titanium, tantalum, nickel, carbon) A word may or may not be ...
11
votes
2answers
786 views

How to get string representation (like repr in Python)

I have a string variable. I want to obtain another string which contains the representation of the string variable content itself. s = "a \n b" I need to get a ...
17
votes
6answers
824 views

Split a string at specific positions

Given a string of alphanumerical characters, how to split it simply and quickly at the center of continuous letter-substrings? Is there an elegant and fast solutions out there in the "computational ...
5
votes
1answer
413 views

Defining a string based sort function

I'm having a bit of trouble figuring out the right Sort syntax to use on a list of lists. Consider the following list: ...
6
votes
1answer
265 views

How to set up new types for pattern matching strings?

Consider the following toy example: I have a set of language sounds, which I partition into two exclusive subsets, consonants and vowels. I want to set up string patterns for e.g. ...
12
votes
1answer
709 views

Rearranging a Polynomial

In Mathematica 8.04 on Windows, I want to display a formula in standard textbook format. The formula is the variance of an $N$-security portfolio. For two securities it is: ...
7
votes
2answers
203 views
16
votes
2answers
937 views

Lexicographic ordering of strings in Mathematica

I recently realized that Mathematica seems incapable of comparing strings in the "normal" expected lexicographic order. Indeed, for some simulations, I need to process text directly, without fiddling ...
7
votes
3answers
243 views

How to turn a set of strings which represent a list into a 2D list

I have a set of data read in from a larger CSV file. I want it to match the format I have from another analysis. It is structured as a series of strings with letters and numbers Here it is copy-pasted ...
10
votes
4answers
562 views

How does string interpolation work in Mathematica

I've noticed that Mathematica 8 seems to have some kind of string interpolation feature, but I couldn't find any documentation on it and I can't figure out how it works. For example, if I enter ...
39
votes
8answers
7k views

How do you convert a string containing a number in C scientific notation to a Mathematica number?

Suppose I have a string containing the C-representation of a floating point number, for example s = "1.23e-5" and I want to convert this to a Mathematica number. ...
6
votes
2answers
549 views

How to overload System`StringJoin to automatically use ToString on arguments?

I am using an overloaded version of the StringJoin function since years now, without any problem, as I've invested a lot of time and effort earlier to make its ...
21
votes
8answers
3k views

How to express an integer number in English words?

How do I convert a number to a readable string? I would like to implement a function, inWords[], inWords[n_]:= ? which ...
16
votes
5answers
3k views

sprintf() or close equivalent, or re-implementation?

Is there a sprintf() command (some command that takes a printf-style format string and a list of values to insert into the ...