Regular expressions are a declarative language, mainly used for pattern matching within strings. Please include a tag specifying the programming language you are using, together with this tag.
0
votes
1answer
13 views
Find the number surrounded by square braces using regex
I need to remove all the numbers appearing inside square braces such as [9] , [2] , ....
This is my regex:
"(?:\[\d*\])"
Which is working fine.
But I am totally ...
1
vote
1answer
20 views
Fraction or percentage regular expression
I'm learning regular expression as part of my Java course. Now I know sometimes the best use of regex is to not use regex at all. But since I have to use it for this course and learn it, I figure I ...
1
vote
3answers
207 views
Calculating the 'binary gap' of a number
Inspired by this question and therefore this one I decided that clearly the best most readable way to solve this is with Regular Expressions.
A binary gap within a positive integer N is any ...
4
votes
2answers
83 views
Restrict HTML input field to decimal
I'd like to restrict user input in a form to a decimal with max two numbers before and 4 after decimal point.
Valid values would be:
50
0.1
1.23
4.5678
12.943
...
3
votes
2answers
37 views
Reg expression for finding expression in sentence
I have a regular expression that match the string that contains the word "duration", followed by a < or > operator and ...
1
vote
0answers
44 views
Regex to obtain float values from a large text file
I am reading a text file and obtaining certain data from the file. The following line is repeated over a million times in the file where the £ values may differ each time.
Start Game, Credit: ...
2
votes
2answers
133 views
Idiomatic word counting in Rust
My goal is to read from standard input, break up the input into words, case-insensitively, and produce a report to standard output, where each line is a word followed by a space followed by its count. ...
-1
votes
2answers
38 views
Find multiple keyphrases from a text
I have keyphrases abc, xyz, pqr, mno, etc. Text - " this text contains abc and mno", want to find whether text contains keyphrase string. I am looking for an efficient solution.
...
4
votes
4answers
96 views
Advent of Code Day 6: toggling lights in a grid with Powershell
I am using the "Advent of Code" series to help with my PowerShell education. The Day 6 puzzle has a 1000 × 1000 grid of lights. After processing instructions to turn on, turn off, or toggle rectangles ...
1
vote
0answers
9 views
Optimize Advent of Code Day 6 with Powershell [duplicate]
I am using the "Advent of Code" series to help with my Powershell education.
http://adventofcode.com/day/6
I am confident that this script will produce the right answer. However, it is going way too ...
2
votes
0answers
36 views
PHP routing system
I made a routing system for PHP inspired by Symfony's router composed of a few classes.
First I am using Symfony's HTTP Foundations component.
Then, I am emulating the classes in the routing ...
2
votes
2answers
60 views
JavaScript function to convert underscore-case to camel-case (and vice-versa)
Actually I needed a function which converts underscore to camel-case.
But then I've had the idea: Why not extend the function so, that is works the other way around?
Finally I recalled that there is ...
2
votes
2answers
17 views
Shortest regex search and sum for integers
Given a text file including different text and integer numbers (text.txt), what's the shortest way of getting the sum of all the numbers out if it? I have:
...
1
vote
2answers
50 views
Matching lines in a CSV file with items in a dictionary
I was wondering if there was a better way of writing this...
I have a CSV file (about 6640 lines). After reading through the file, the values for the DFN_Network ...
-1
votes
1answer
41 views
Replacing address details in colon delimited string
I'm sanitising personal data in a large database with a series of Regular Expressions. In many cases the sensitive data is in a colon-delimited field within a CSV file.
Here is a sample:
...
2
votes
1answer
45 views
Associate an object with a regular expression in Python
Is there a way I can link/associate an object (in this particular case a function) with a regular expression pattern?
Here's the function I'm working on:
...
2
votes
1answer
44 views
JavaScript text-analyser to determine how often a defined word appears in text
The idea of my application is to have the user provides text which is pasted (or written) inside the textbook and further provides a search word.
The application then shows the overall count of words ...
0
votes
1answer
37 views
Compiler for grond, a language-in-the-making
I'm working on a language called grond (see it on GitHub); the compiler is so small it is included in this post.
My gut tells me that this code is awful, but it works. I am hesitant to change things ...
2
votes
1answer
114 views
2
votes
4answers
535 views
regex to extract version info
I have written a small Python function to extract version info from a string.
Input is of format:
v{Major}.{Minor}[b{beta-num}]
Eg: v1.1, v1.10b100, v1.100b01
Goal is to extract Major, Minor and ...
4
votes
3answers
562 views
Eval is evil: Dynamic method calls from named regex groups in Python 3
I'm working on a simple dice roller for a Python IRC bot. The particular game this roller is for uses six different kinds of dice, which I've defined using a simple base class, and created six ...
1
vote
1answer
70 views
JavaScript function which checks the count of words in a string
Task to accomplish: Made a function which counts the amount of words in a sentence.
Please don't put attention to the HTML. Is just for testing-purposes.
...
1
vote
2answers
65 views
Sum all numbers in text using regexp
I would like to improve everything that can be improved. I don't understand regex a lot and what could be wrong. The main improve that I am looking for is related with errors. I want make the code ...
3
votes
1answer
40 views
Webpack loader for Phaser.io asset files
The following is a webpack loader for Phaser asset files. The way this is supposed to work is that it looks at the json string, and finds all of values with "url" keys in the json object, and ...
0
votes
1answer
51 views
Regex for mobile number validation
In my country (South Africa) mobile numbers have 10 digits and always start with a "0" (e.g. 0821231231).
But they can also have the international dialing code ("+27") replacing the "0" (e.g. ...
4
votes
2answers
74 views
Terminal Chat Room
Summary
I have written a pair of Perl scripts that form a UDP chat room allowing users to send messages over the internet with RSA encryption, making the messages imune to MITM attacks. The scripts ...
4
votes
2answers
126 views
Regex for matching expression that consists of single digit numbers and operators
I would like to create a regex that will validate that a string is an equation made up of a single digits and either the * or + ...
2
votes
1answer
61 views
Regular expression matching with string slice in Go
I have a slice of strings, and within each string contains multiple key=value formatted messages. I want to pull all the keys out of the strings so I can collect ...
5
votes
3answers
416 views
Parsing a complex number using regular expressions
Requirements were to create a constructor for a complex number, that receives a string. For example: \$3+5i\$. The regex extracts positive or negative numbers from the string with optional decimal.
...
1
vote
1answer
47 views
Finding a substring within a string using regular expressions
I'm new to Java and is trying to find a substring within a string using regular Expressions. I was just wondering if there are any alternative ways to achieve the same goal, or in a more elegant or ...
2
votes
1answer
36 views
Wikipedia indexer and shortest link finder
I have the following code, how can I make it more efficient? Also, it doesn't always find the shortest route. (See Cat -> Tree)
...
2
votes
3answers
133 views
Adding minutes to a time value in Ruby
I recently submitted a code-challenge for an interview according to the following guidelines:
About
Write a function or method that accepts two mandatory arguments and returns a result.
...
1
vote
1answer
51 views
Creating a RegExp in JavaScript from user input
My goal is to accept user input regex in the following forms
/regex|here/i
/regex|here/
...
1
vote
2answers
56 views
Regex to match strings safely
The following regex is meant to improve stringmatching by sanitizing the user -defined commandPrefix and checking for whitespace and line-endings after the ...
3
votes
2answers
77 views
Parsing HTML from multiple webpages simultaneously
My friend wrote a scraper in Go that takes the results from a house listing webpage and finds listings for houses that he's interested in. The initial search returns listings, they are filtered by ...
6
votes
2answers
97 views
Parsing option symbols
I think I have this working, but I'm not sure it's completely accurate.
I'm trying to parse Option Symbols. An Option Symbol is made up of 4 parts:
Root Symbol (up to 6 characters)
Expiration Date ...
8
votes
1answer
113 views
RFC 4180-compliant CSV parser in Java
While looking at a recent question, I realized that there is no CSV parser in the standard Java library. I decided to write one that complies with RFC 4180. Highlights of the standard include:
...
2
votes
1answer
63 views
Convert #hashtagstylephrases to a proper list of words
I'm writing a program to split the words contained in an hashtag.
For example I want to split the hashtags:
#Whatthehello #goback
into:
...
2
votes
2answers
185 views
Regex to first match, then replace found matches
In my C# program I am using Regular expressions to:
Loop through a list of possible words in need of replacing.
For each word, to find out if a string I am given has any matches.
If it does, I ...
4
votes
1answer
77 views
Syntax highlighter for HTML and PHP
I've created a JavaScript application to highlight the syntax of HTML and PHP. I know a lot of syntax highlighter are available nowadays, I just created to extend my knowledge in JS and regular ...
9
votes
1answer
80 views
Highlight specific words in a sentence with diacritrics
I am searching for some improvements, particularly in the regex, in the way I highlight specific words in a string.
I have keywords into my database stored without any diacritrics
The user comes ...
2
votes
1answer
59 views
Truncating article text
I need to show article's content based on this logic:
if article's content has to be truncated (e.g for preview)
if there's [read more] substring in the content
...
6
votes
1answer
105 views
C# Regex to extract bug ID from Bugzilla JSON response
I have written a series of Regex.Replace() lines to take an input like {"id":36} and convert it to ...
3
votes
2answers
207 views
Multiple regex matches to correct OCR output
Using OCR, my program reads the current selection for each of these categories: format, invert color? and ...
4
votes
1answer
47 views
UK postcode validation and format correction tool
I've been working on a regex-based UK postcode validation and format correction tool - with the aim of creating a list of postcodes that can be readily geocoded. The variety of postcode formats is ...
4
votes
1answer
158 views
Simple lexical analysis - basic calculator
I recently found an interesting series that describes the specifics of how interpreters and compilers work, explaining each step (with code) and encouraging the reader to do exercises.
My code is ...
3
votes
2answers
53 views
Multiple regex replacements
I receive a string with a lot of characters that I don't need and I am trying to remove them and replace them with characters that I am able to work with. My current structure has me redefining the ...
8
votes
2answers
129 views
Number to Roman numerals
I've been working on numerals conversion lately. Now the JavaScript course I'm following asked me to do something similar for Roman numerals.
To keep things fresh and given the amount of test-cases ...
5
votes
1answer
66 views
Read through a log file to find “Fail” lines
Please bear with me, I'm only about a week into Python.
This code is something that I wanted to do once I completed the chapters dealing with opening and reading files, and RegEx. I always feel like ...
3
votes
1answer
80 views
RFC 2812 message validation regex
In my ongoing quest for an IRC client, I'm working on more stringent validation per RFC 2812. As with everything else I'm doing on this project, I'm trying to implement it all from scratch for the ...
