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

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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 ...
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 ...
26
votes
0answers
356 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: ...
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 ...
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
213 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?
1
vote
2answers
142 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
2answers
262 views

Transform fancy usage messages in 1D string

When we look at the usage messages of built-in functions nowadays (not in the good old times, when they were a simple descriptions) we see that although they look pretty in the front end, it is really ...
2
votes
2answers
218 views
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: ...
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 ...
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. ...
0
votes
3answers
286 views

How to export a header before the data in the result file?

I would like to export a phrase to my result data as a heading. I'm exporting the data correctly with Export["file.dat", table]. But I'm doing several ...
9
votes
3answers
228 views

balanced Shortest[] and string-patterns

The pattern Shortest["A"~~__~~"B"] is oriented : It assumes the text is read from left to right and it takes the text between the first "A" and the next "B". Any ...
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
234 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 ...
3
votes
5answers
299 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 ...
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 ...
10
votes
9answers
2k views

How do I extract a number from a string?

I want to extract the number from an alphanumeric string. This is what I tried: StringTake["thiru3", {6, 6}] The result I got is ...
2
votes
3answers
312 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 ...
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: ...
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 ...
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? ...
9
votes
5answers
592 views

convert long string to integer list

at first, i would like to thank all the people here. i'm working with mathematica for half a year now and always found great advice and tricks. now, i came up with a problem i couldn't find a ...
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 ...
3
votes
2answers
164 views

Import[] exception possibly caused by ToString[] behaviour which I cannot explain

Let me just start by pointing out I'm a new StackExchange user as well as a new Mathematica user (started today!) I mention this as a context to my ineptitude :) I am attempting to read through a ...
4
votes
1answer
59 views

WordBoundary issue in StringReplace

Why does the following StringReplace pattern match: ...
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 ...
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 ...
2
votes
1answer
107 views

ToString in a function

f[x2_] = ToExpression[StringTake[ToString[x2], -1]] x2; f[a3] (*Out: 2 a3*) I expected the output to be 3 a3, but apparently ...
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 ...
4
votes
2answers
325 views

Split string into sub-strings of length n [duplicate]

Possible Duplicate: Partition string into chunks How can I split a string into sub strings of length n? For example I have a string "ABCDEabcde1234" ...
6
votes
3answers
203 views

Importing and manipulating strings - time data

I have a list of time durations, which are strings of the form: "hh:mm:ss". Here's a sample for you to play with: ...
8
votes
2answers
1k views

Convert a string to hex number?

How can I convert a string containing a hex number such as "6b" to a hex digit that mathematica can use to do math with? I have tried using ...
21
votes
3answers
913 views

How to join two Style[]d strings

Does anyone know whether it is possible to combine\join two styled strings? That is, while the following code works fine: omega = "text"; omega<>omega ...