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
0answers
17 views
Removing comments from code with a program [migrated]
I'm working on a problem that requires me to remove comments from Java code and print out the results. I tried to use regex and came up with this.
private static void stripComments(Scanner input) {
...
8
votes
1answer
58 views
Help speeding up my first Bash script
This is my first more-than-1-line script. It takes an inputfolder and a file prefix and get all the files matching. For the first of the files, the script grabs the first line and appends an extra ...
3
votes
2answers
82 views
Parsing annotation
I have implemented code for parsing annotation:
/**
* @Route(path="sample \n test",code,value,boolean,test)
* @access(code=false)
* @sample as asdad asd
* asd
*/
function sample()
{
}
...
7
votes
1answer
57 views
HTTP Authorization header parser
I'm writing a parser for HTTP Authorization header (see RFC2616#14.8 and RFC2617#1.2). Note that I explicitly don't care about the base64-encoded syntax used by HTTP Basic authentication. I'm only ...
2
votes
2answers
72 views
Whitelist HTML tags Microsoft Sanitizer and custom Regex
I have the following code which I have written due to the fact the Microsoft's Sanitizer is now to aggressive.
What I'm trying to do is as follows.
Create a whitelist of HTML tags I want to keep
...
2
votes
1answer
52 views
Dice notation roller in JavaScript
I have the following function, intended to take standard dice notation (XdY+Z) and return a (sort of) random number based on the input. Are there any bugs/bad ideas/optimizable sections I am missing?
...
9
votes
2answers
209 views
Matching script tags with regexes
Like anything that shouldn't be done, I decided to see if it is possible to match <script> tags robustly using regexes in PHP. Since there is no arbitrary nesting, I figured it should at least ...
4
votes
1answer
88 views
Getting data correctly from <span> tag with beautifulsoup and regex
I am scraping an online shop page and I am trying to get the price mentioned in that page. In the following block, price is mentioned:
<span id="hs18Price" itemprop="price" title="New Baby Care ...
5
votes
1answer
78 views
Trying multiple regexes against a single string
I have a huge list of regexes (>1,000 but <1,000,000) that I want to test against (many) single strings.
It is unlikely and unintended that more than one such expression would match a single ...
7
votes
5answers
125 views
Reading from text file with RegexMatch
Below is the method that I have written for reading from a text file. While reading, I need to match line string to given regex and if it matches then I need to add the line string to a collection.
...
3
votes
1answer
64 views
Regex to clean text in preparation for word count in PHP
EDIT: Here's my totally-revised PHP...
$text = preg_replace("~[^ a-z0-9'-]~"," ",strtolower($INPUT));
for($i=1;$i<strlen($text)-1;$i++) {
if(preg_match("~['-]~",$text[$i]) && ( ...
5
votes
1answer
66 views
Calculate query coverage from BLAST output
I have a BLAST output file and want to calculate query coverage, appending the query lengths as an additional column to the output. Let's say I have
2 7 15
f=open('file.txt', 'r')
...
6
votes
2answers
94 views
Recursive Regular Expressions
I want to first search for a specific regular expression.
If it is not found then I would like to search for another regular expression
If that one is also not found then I would like to search for a ...
0
votes
2answers
121 views
Remove a parameter and its value from URL's query string
I'm coding an algorithm to remove a parameter (let's call it foo) from URL strings.
Of course, after the foo parameter removal, the query string should remain valid (with a leading ? and remaining ...
7
votes
1answer
112 views
How could I improve this map-reduce code?
I have been changing this code and I don't get to make it much better, I changed a little bit the structure, reimplemeted a new function for splitting Strings which is more efficient, etc. I have been ...
4
votes
4answers
72 views
Help in deciding how to represent a long regular expression
I wrote a simple Polynomial class:
class Polynomial
def initialize(coefficients)
@coefficients = coefficients.reverse
end
def to_s
return '0' if @coefficients.all?(&:zero?)
...
1
vote
1answer
54 views
TCPDUMP file (part of a real capture)
I have been working on this code for quite a while and just want to make sure it is up to good standards. I know many of you will have questions, so as they come up, I will edit my initial question to ...
3
votes
2answers
75 views
Either or case in Python and Regex
I have a small module that gets the lemma of a word and its plural form. It then searches through sentences looking for a sentence that contains both words (singular or plural) in either order. I have ...
2
votes
3answers
325 views
Convert Sql LIKE to Regex
I have a bit of code that converts a Sql Like expression to a regex expression for the purposes of a Linq to objects Like extension method. For some time I have been using this conversion.
This ...
6
votes
3answers
107 views
A regex in Java. Latin letters, digits, dots, and minus signs
There is a user login, and the requirements are the following:
The login must start with a Latin letter.
The login must finish with either a Latin letter or a digit.
There may also be digits, ...
2
votes
1answer
57 views
3
votes
3answers
58 views
Limited typecasting with regex
long time user/lurker at stackoverflow, first time here. I've seen a lot of questions like this have people point to this section of the StackExchange network so I hope this is the right place.
I'm ...
4
votes
1answer
133 views
Regex parser - request for review and optimization
The whole question is Better implementation of a simplified regular expression engine?.
I have solved the question, and in turn felt the need to get it reviewed. Any suggestions for clean up and ...
0
votes
2answers
81 views
Reducing number of blank spaces
This program takes blank spaces before some chars like > < />, and if there is more than one blank space in the line, it will reduce to one.
return source.replaceAll("\\s{2,}", " ...
5
votes
2answers
368 views
What do you think of my regex for URL validation?
I would like you to review my regex. It's suppose to recognize common URLs like:
http://www.google.com
http://www.sub1.sub2.google.com
https://www.google.com
http://www.google.com/path1/path2
...
1
vote
2answers
207 views
Performance: getting first value from comma delimited string
I've got a string that has values that are delimited by comma's, like so:
$var = '1,23,45,123,145,200';
I'd like to get just the first value, so what I do is create an array from it and get the ...
2
votes
1answer
167 views
How to replace plain URLs with links, in javascript? [closed]
I've nearly got this working. I wanted to know if there is a much better way. One problem is that no matter what there will be cases where a URL is incorrectly identified and as such the end result ...
3
votes
1answer
92 views
Optimize regex for maximum speed
According to http://stackoverflow.com/questions/19608546/optimize-regex-for-maximum-speed
and comments to ask my question here .
Please help me to optimize following regex to best performance . I have ...
1
vote
2answers
100 views
How do you “sordid sort” alphanumeric strings?
The question is about sorting alphanumeric string in a "more natural" order. Source: Marc LeBrun's "Sordid Sort" Computist Quiz
Often a system string comparison sorts alphanumeric data ...
1
vote
2answers
144 views
Trying to improve my javascript code in this simple challenge from coderbyte
Here is a slightly modified challenge from Coderbyte:
Determine if a given string is an acceptable. The str parameter will be composed of + and = symbols with several letters between them (ie. ...
1
vote
2answers
67 views
Checking name E-mail and unit-test
Please tell me what you think. Is my code bad?
Function checking
#-*- coding: utf-8 -*-
import re
import unittest
def email_check(mail): # E-mail as argument func
compil = re.compile(r"""
...
16
votes
4answers
1k views
Regex to parse semicolon-delimited fields is too slow
I have a file with just 3500 lines like these:
filecontent= "13P397;Fotostuff;t;IBM;IBM lalala 123|IBM lalala 1234;28.000 things;;IBMlalala123|IBMlalala1234"
Then I want to grab every line from the ...
5
votes
1answer
66 views
dir=“auto” JavaScript shim for IE
Reason for script:
dir="auto" is an attribute value from the HTML 5 spec with current poor support in IE and Opera browsers ...
2
votes
1answer
92 views
JavaScript HTTP regular expression
I am currently using the following to convert [url=][/url] to an HTML link:
s = message.replace(/\[url=([^\]]+)\]\s*(.*?)\s*\[\/url\]/gi, "<a href='$1'>$2</a>")
That work's fine.
I ...
1
vote
1answer
99 views
wild card pattern matching algorithm
i was trying to write code which does a validation for below wildcards:
'?' ------> The question mark indicates there is zero or one of the preceding
element. For example, colou?r matches ...
0
votes
1answer
41 views
Cleaner RegEx Syntax
I've got information that is imported from a CSV file that my site grabs every day with PHP. I'm just learning RegEx so I'm able to do what I need to do but am looking to get more efficient with my ...
1
vote
4answers
122 views
How can I shorten and remove repetition from this Python script?
I've got a CSV that contains users and permissions in the below format, where users can have as little as one or as many as eight different permissions:
...
1
vote
2answers
98 views
Optimization of a while-loop searching for words in a dictionary
This is my first question here. I'm using an open source program called MElt which lemmatize (give the lemma example:giving-->give) of words. MElt works on Linux and its programmed in Perl and ...
3
votes
1answer
372 views
Regex to remove inline javascript from string
I need to remove inline javascript for a given string. Examples:
If user typed: <img onload="something" />
I should need to convert into <img />
I created this PHP code and it ...
0
votes
1answer
88 views
Avoiding dynamic RegEx creation in JavaScript
This function's job is to replace several text smilies, e.g. :D, :), :love with the appropriate smiley image.
In my opinion my code has several issues, yet the main problem is that a lot of quite ...
1
vote
0answers
133 views
Regular Expression Generator [closed]
This library allows you to call functions to describe a regular expression, and then check if a string matches that regex- or replace things in a string based on that regex. I am trying to improve my ...
0
votes
3answers
60 views
Structured instructions for simple extraction script
I have a rather simple task in trying to extract keywords from input.dat which looks like:
func1
{
yes true;
keyword123 (1.1 0 -0.3);
gamma (0 1 0);
dir ...
3
votes
1answer
232 views
String Interpolation / Word Matching with XML in C#
I'm working on a project where I need to map XML values to field names. Classic CS problem, I think I've got a pretty good approach but would like feedback.
For example: breachReportType matches to ...
1
vote
1answer
569 views
string compare, sort, regex split
I am writing a simple code to accept/read a input of lines from a text file, split it into my class variables, sort them and finally display the input in the ordered form. But I am struggling past ...
4
votes
1answer
336 views
Faster code for SVG path parsing? Perhaps improved regex?
I have a module in Python for dealing with SVG paths. One of the problems with this is that the SVG spec is obsessed with saving characters to a pointless extent. As such, this path is valid:
...
3
votes
1answer
823 views
Trim certain characters from a string in javascript
I want to remove not only spaces, but certain characters aswell from the beginning or end of a javascript string.
function trim(str, characters) {
var c_array = characters.split('');
var ...
2
votes
2answers
156 views
Matching a pattern in many lines of text
This is the relevant piece of my code (false is returned if the whole cycle is finished, pattern is a String passed to the function):
for (FileLine fileLine : fileLines) {
itemText = ...
1
vote
1answer
60 views
Regular Expression in Javascript to test a string of 1s and 0s
I have a string of four bits which represent true/false values. There are only seven valid options:
1010
1110
0000
1101
1001
1000
0101
There are three options which could potentially be selected ...
2
votes
2answers
157 views
Should I be using Regex to uppercase uncommon characters?
I've written a function for converting strings to upper case. It currently works by replacing each character using a Regex pattern with a hash:
# Special upcase function that handles several ...
3
votes
1answer
128 views
Mathematical expression evaluator.
Code reviews and suggestions to improve coding style are welcome.
using ExpressionEvaluatorLibrary;
namespace ExpressionEvaluator
{
class Program
{
static void Main(string[] args)
{
...
