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

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3
votes
1answer
129 views

Importing strings in Mathematica

This is my first post so apologies if any obvious mistakes. I'm trying to work on a data containing names (in quotes) in Mathematica. The data is already saved on my system under ...
6
votes
1answer
208 views

String pattern search and replacement — it works, but produces error messages only the first time it is called

I defined a function in Mathematica to process a pre-generated string. More specifically, I'd like to process some parts of C codes generated from MMA. Basically what my function does is to expand the ...
6
votes
1answer
181 views

Match sequence of zero or more characters except a given character

This looks like it should be simple: I want to match an "i" followed by an "o" with an arbitrary (possibly zero-length) sequence of characters in between, unless that sequence also contains an "i". ...
1
vote
1answer
115 views

Searching a string that may contain Null

I have an array of triplets that can be approximated by the following code: ...
2
votes
1answer
162 views

Showing special characters in text containing unicode

How does one conveniently convert a string like: "Ya no me burlar\:00e9 de la diabetes de Nick Jonas. Me lo guardar\:00e9 para cuando le corten la pierna. S\:00ed es que a\:00fan alguien lo recuerda, ...
3
votes
5answers
298 views

How to write a function to remove comments from a .m source file preserving formatting such as line wrapping reasonably?

How to write a function to remove comments from a .m source file preserving formatting such as line wrapping reasonably? This means if I have ...
5
votes
6answers
172 views

Selective thinning of string elements in nested lists

I have a nested list similar to this example list (but much bigger and more messy): ...
2
votes
1answer
156 views

How to extend dictionary.txt

How to extend the default dictionary.txt for Dictionarylookup to all words? For example, first I ...
2
votes
1answer
139 views

Explicit asterisk or @ sign in string patterns

What string pattern will match an explicit asterisk (*) or at-sign (@)? The obvious example, StringMatchQ["*", "\*"], returns ...
4
votes
5answers
220 views

A simple StringCases problem

Given this text: text1 = " A Vitamin D Deficiency (ICD-9-CM 268.9) (ICD-9-CM 268.9) 09/11/2015 01 "; Yes, the ICD code values are duplicates- possibly but ...
26
votes
0answers
355 views

Why is StringExpression faster than RegularExpression?

Edit: as noted by Albert Retey the performance difference is only seen when sub expression extraction is performed. If this test is used below the timings are similar: ...
23
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
3answers
217 views

Find the position of a string element, knowing only part of the string

I have a list, e.g.: list = {1, 2, 3, "Element 1", 4, 5, "Element 2", "Something else 1", "etcetera"} Now, I want all elements starting with ...
6
votes
1answer
108 views

How does `LongestCommonSubsequence` work?

When I recently came across this posting about LongestCommonSubsequence I was curious about how the function worked. ...
3
votes
1answer
212 views

String replacement to make the TeXForm output beautiful

This question is inspired by this question: How to convert the symbol $d$ in Integrate into $\mathrm{d}$?. Although it’s not a big problem, the TeXForm can be ...
0
votes
0answers
93 views

How to highlight a string pattern? [duplicate]

This is an example in the help pages (Working with patterns: Highlight Patterns): ...
10
votes
1answer
399 views

Mathematica equivalent of regex '\w{2,3}'

It beats me to write the Mathematica pattern equivalent to the regex: \w{2,3} Any ideas?
33
votes
3answers
1k views

Visualizing the difference between two sequences (strings)

I'm trying to develop a way of comparing two sequences (probably originally text, such as text writing or source code, possibly converted to lists). As a familiar example, consider the revisions ...
1
vote
2answers
141 views

Image processing - How can I apply an operation to several images at once?

I imported pictures into Mathematica, and used names for them that follow the easy scheme "name" string joined with an integer, ranging from 14 to 20. Printing these images on screen works nicely: ...
0
votes
2answers
108 views

help with StringJoin [duplicate]

dollarWon := 100 "(" <> Style["$" <> ToString[dollarWon], If[dollarWon >= 0, Darker[Green], Red]] <> ")" I am getting an error: String ...
5
votes
2answers
141 views

How to count words in a Greek text

I want to perform a simple analysis of some Greek text: collect the different words used and count their frequency. It seems that some of the built-in commands do not work well with Greek letters. For ...
1
vote
2answers
120 views

How to convert TableForm to proper LaTex and why is “\” not replaced by StringReplace?

I'm trying to optimize the teXForm output of a table because the standard output ist not satisfying: ...
11
votes
1answer
454 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: ...
9
votes
3answers
369 views

How to remove accents from text?

I would like to know how I can remove accents from a string. For example, how can I transform "string test áéíóú" into ...
4
votes
3answers
1k views

Parameters in plot titles

My issue is how to mix strings with variables, specifically in the context of PlotLabel: I can put a string as my plot title, and I can also put a variable as a ...
7
votes
3answers
236 views

Unencoding encoded URLs in a function

Is there a built-in function for decoding encoded URLs in Mathematica? I would like to convert an encoded URL, for example ...
14
votes
2answers
267 views

Haiku Extractor

Inspired by the cool Tumblr Haiku Times that searches for accidental haiku in New York Times articles, I tried my hand at implementing such a search in Mathematica for my own text samples. I'm still ...
1
vote
2answers
121 views

Finding strings in Web Code [duplicate]

I haven't found an answer that solves my problem, although I think it's actually a simple one. It seems hard to me because I don't have a lot of experience with string patterns. I have a Web Code ...
0
votes
1answer
130 views

Construct file names using a number and a string prefix [duplicate]

I'm trying to append filenames with Mathematica, and cannot do it. The output of my calculation are two lists : X and Y, ...
-4
votes
2answers
149 views

how can i convert data into string format? [duplicate]

I have nested-lists in number format,like data={{1,2,3},{2,{3,4,50}},{4,5,6},{3,{3,{5,6}}}} I want to convert each number into ...
5
votes
1answer
136 views

Extracting text from cells, preserving non-ASCII characters

Consider the following setup, based on this answer by WReach: ...
0
votes
1answer
148 views

How do I construct a “named character” programmatically?

Why am I getting the error Syntax::sntunc: Unicode longname in the string is unterminated. from the following? ...
6
votes
4answers
264 views

Where can I take a pool of words from?

Dear Community members, I am thinking about an interactive machine to teach a school child to write difficult words correctly. As a first step I need a collection of words. I will select a pool of ...
1
vote
2answers
116 views

Why do I get two different results from StringLength?

I spent a reasonable amount of time to find the origin of an error in a larger code segment. ...
1
vote
2answers
1k views

Faster way to convert real strings into numbers [duplicate]

Working with big files, I have to convert some numbers that are in string format into real MMA numbers. I know that I can use ToExpression but it's slow when ...
21
votes
6answers
518 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 ...
2
votes
3answers
311 views

How to extract a consecutive list of substring from a string?

Given a list of strings: data = { "2894;Hot Pink;53:09:44;1449714", "17456;Dark Cyan;19:06:42;6929227", "5147;Lime;54:11:55;5247632" } (Words are separated by ...
7
votes
1answer
1k views

What pattern will match accented letters in a regular expression?

How should I modify the following such that the accented letter É is matched and the expression returns True? ...
5
votes
2answers
233 views

Concatenate strings from different levels of list

After a lot of trouble I've finally come pretty close to what I want to do. I now have a list that looks like this: ...
2
votes
1answer
107 views

Confused behavior using Dispatch to sort one list relative to another

I have a need to sort the entries of one list into the same sequence as the entries in a reference list. Because I have rather large lists involving strings, I'm trying to use Dispatch to accomplish ...
1
vote
1answer
209 views

Renaming files of form FileName(i).csv to NewNamej(k).csv where j increments and k resets to 1 when there is a jump in i?

Edit up top: The accepted answer works splendidly except I had to add //ToExpression to the end of the definition of ns given by ...
23
votes
1answer
539 views

Convenient string manipulation

With Mathematica I always feel that strings are "second class citizens." Compared to a language such as PERL one must juggle a lot of code to accomplish the same task. The available functionality is ...
14
votes
6answers
437 views

Splitting a list by specifying section headers

I have a list of strings called mylist: mylist = {"[a]", "a", "a", "[b]", "b", "b", "[ c ]", "c", "c"}; I would like to split ...
3
votes
0answers
111 views

Unicode beyond Basic Multilingual Plane

String manipulation takes a dive when characters beyond \:FFFF are used e.g. Mathematical Alphanumeric Symbols. The characters display fine but doing string ...
4
votes
2answers
96 views

How can I know if a pattern corresponds to a string pattern?

What would be the best way to detect if a pattern corresponds to a string pattern ? An invalid string pattern p would lead to an error in ...
10
votes
2answers
289 views

Mathematica Typing Effect

Here is a Typing Effect in javascript. I could only implement a very simple one: ...
4
votes
1answer
106 views

Strange behavior of DateList when converting string

DateList experiences some strange behavior which i cannot explain. This code works fine: ...
17
votes
2answers
1k 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 ...