Questions tagged [regex]
67563 questions
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How to find with lookahead in Visual studio 2012 Regex Find and Replace
I am trying to find all using statements that are in cs files that contain a reference to a class anywhere in the file following it.
For example, I want to match using Example.Foo; if BaseClass is found anywhere in the file following it.
Like such:
I've tried (using Example.Foo;)(?=[.\s\n]*BaseClas...
1
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1
answer
837
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Clean up img tags in a full html string
I have a full HTML string. It looks like this:
This is a test
What I would like to do is clean up the source. I want to remove all widths and heights in the img tags only. I want to preserve the ID and SRC attributes.
1
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4
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Print the column which contains only the mix of alphabets & numbers
Is there any one liner to print the lines which contain only the mix of alphabets & numbers in a file?
I tried the following. But it doesn't work out.
awk '{print $3}' test.log | grep -o '.[0-9][a-zA-Z]*'
EDIT:
Content of test.log:
aaa bbb 1 ccc
aaa mmm a1 nnn
ooo bbb bc12 dm
My intention here i...
1
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1
answer
406
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strange AssertError when using fest regexp assert
I am getting this error - but the regex should imho match the string - would love to know what is the problem here
java.lang.AssertionError: should match the regular expression:
at org.fest.assertions.Fail.failure(Fail.java:228)
at org.fest.assertions.Assert.failure(Assert.java:149)
at org.fest.ass...
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3
answer
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Regex to replace spaces and brackets with underscore
I have some strings in the following formats:
this is a string
This is a string
This is a (string)
This is a string
and i want a regex convert it to the following:
this_is_a_string
with no leading
I have the following using preg_replace which is getting me almost all of the way:
preg_replace('/[^A-...
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1
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exchanging Unicode char ruins char before this unicode char
I have a big list with unicode char's, which i want to exchange with some ASCII chars with following code (This code does some stuff more):
while ($Zeile=)
{
@Zeile=split('\t',$Zeile);
$i=0;
foreach(@Zeile)
{
if ($i>1)
{
$entry=$_;
$entry=~s/\(Details\)/ /;
$entry=~s/\x{00BC}/.25/;
$entry=~s/\x{00B...
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1
answer
55
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How to extract an Integral pattern out of a String using Regular Expressions
I am trying to make a mapLoader, which reads in a text file (here is an example) of the file
[5,3,3,900,3,89,3,3,3,3,3,430,3,1439,3,65,3,320,3,3,3,3,3,3]
[3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,21,3,3,3,3,3]
[5,3,3,900,3,89,3,3,3,3,3,430,3,1439,3,65,3,320,3,3,3,3,3,3]
[3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3...
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7
answer
3.7k
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Javascript: String search for regex, starting at the end of the string
Is there a javascript string function that search a regex and it will start the search at the end?
If not, what is the fastest and/or cleanest way to search the index of a regex starting from the end?
example of regex:
/]*>?/gi
1
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2
answer
98
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Expressing regular expression in words
I am trying to express the following regular expression in words. Please not this is not so much a programming regex, as opposed to some CS work I am doing. The regular expression is:
(ab + b)* + (ba + b)*
The spaces are meaningless and the '+' functions as an 'or'. My answer right now is:
"This reg...
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5
answer
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Verify the domain of an e-mail address
I am writing a Python script that checks the inbox of an IMAP account, reads in those e-mails, and replies to specific e-mails. However, for security reasons I need to make sure that the original sender of the e-mail came from a particular domain.
I am reading the e-mails in Python using the email...
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2
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1.8k
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Regex capture lookbehind and lookahead
I'm trying to write regex for the following situations:
badword%
%badword
%badword%
The % signs differ, depending on where they are. A % at the front needs a lookbehind to match letters preceding the word badword until it reaches a non-letter. Likewise, any % that is not at the front needs a lookahe...
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2
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58
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Get the matches from specific groups
I want to validate a String and, after that, get all the matches from some groups.
RegEx:
/^::=()+(\|()+)+$/
So, if I get something like ::=|| is valid, but if I get something like ::=| is false.
There's no problem with the validation, the problem is that I want to take the text inside < and > becau...
1
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2
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regular expression with limited special characters in jquery [closed]
I would like to all alphanumeric data +
only these following 4 special character are allowed.
' (single quote)
- (hyphen)
. (dot)
single space
I tried this :
var userinput = $(this).val();
var pattern = [A-Za-z0-9_~\[email protected]#\$%\^&\*\(\)]+$
if(!pattern.test(userinput))
{
alert('not a valid');
}
but...
1
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4
answer
1.9k
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How to match multiple expression repeatedly by regexp in lua
I'm learning lua.There are some question in regexp.
I have some string as:
text = "aaab1aaac-aac1d2b5hhpt456d5h9h8"
I want get result as:
"b1", "c1b2b5", "t4", "d5h9h8"
I write the code as the following.
local st,ed
while true do
st,ed = string.find(text,"([a-z][1-9])+",ed) --the regexp
if st==nil...
1
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2
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3.7k
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Regular Expression: Double Backslashes in Bracket Expression
What do the double backslashes in the following expression match?
/^[\\?]/
Is it a filter for \ and & (escaped backslash) - or - \\ and & (not escaped) - or - \ and ? (escaped question mark)?
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1
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Combine two regular expression into one while validating Attribute
I have two regular expression.
[RegularExpression(@".*[^ ].*", ErrorMessage ="Something")]
validate string that only contains spaces(Not any other characters
Ex: " ".length = 7).
[RegularExpression(@"^[^[email protected]#$%&*]+$", ErrorMessage = "something")]
validate string that contains [email protected]#$%&* special...
1
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1
answer
932
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Java Regex in round brackets
I am trying to parse an input string like this
String input = "((1,2,3),(3,4,5),(2,3,4),...)"
with the aim of getting an array of String where each element is an inner set of integers i.e.
array[0] = (1,2,3)
array[1] = (3,4,5)
etc.
To this end I am first of all getting the inner sequence with this...
1
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1
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85
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C# Regular Expression - break text into specific pieces
Friends I am applying R.E @"^(.*)([0-9/+-^]+)=([0-9]+)$"on string "3u->4+5=8". While fetching Group[1] it returns "3u->4+" and Group[2] it returns "5".
According to me,
Group[0]="3u->4+5=8"
Group[1]="3u->"
Group[2]="4+5"
Group[3]="8"
Should be there. Kindly help
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1
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Optional regular expression match
I have an string like 1566-02, where -02 is optional. If I use a regular expression like this
1566\s*-\s*\d{2}
it will always expect 2 numeric number with hyphen after 1566.
How I can make the -02 part optional, so that the IsMatch should be true for 1566 also?
For example -
The value of IsMatch sh...
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3
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Regex - Allow alphanumeric, comma, period and space using PHP
I found many places where question like this are solved but I have no idea why is it not working for me.
$reg = '/^[a-zA-Z0-9,. ]*$/'; // regex to allow only alphanumeric, comma, period and space
$count = preg_match($reg, $arr[1], $matches); // verify regex
if($count > 0){
$objArray[] = array($arr[0...
1
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2
answer
1.9k
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Splitting string using backslash using regex
For a python program I have an input that I am taking from stdin and the input is something like:
"-------/--------\---------/------\"
When I print it out as a string value it is printed as it is. I am trying to split the string into a list of strings based of forward and backward slash while keepi...
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1
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unicode regular expressions c++
I want to match the word "février" or any other month by using regular expression.
Regular expression:
^(JANVIER|FEVRIER|MARS|AVRIL|MAI|JUIN|JUILLET|AOUT|SEPTEMBRE|OCTOBRE|NOVEMBRE|DECEMBRE|Jan|Feb|Mar|Apr|May|Jun|JUN|Jul|Aug|Sep|Oct|Nov|Dec|[jJ]anvier|[Ff]évrier|[mM]ars|[aA]vril|[mM]ai|[jJ]uin|[j...
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2
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Regex - nested lookahead assertion
suppose we want to match all one(s) between ... in this text (option: dot matches all):
hello!
home one
living
one text
text one continues
and at last here ends one
dog one
bye!
let's say we use this pattern:
one(?=(?:(?!).)*)
I really appreciate it if someone explains how regex engine process that...
1
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1
answer
799
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how to traverse a unicode tamil word character by charcter in python?
I want to know how many characters are there in a Unicode string (Tamil) and then check the character1 and character2 for particular occurrences.
I am able to split the word into characters, but I do not know how to traverse through them character by character using the word length.
Example : word...
1
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3
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60
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String Manipulation with Regular Expression specifically or statements
I am trying to parse out certain strings from a phrase. This is the phrase:
'1st Floor 2nd Floor 3rd Floor 4th Floor'
The end phrase should be:
'1st Floor','2nd Floor','3rd Floor','4th Floor'
I am having trouble getting the '1st','2nd','3rd','4th' parts of the regex. I know I can do a less-intuitive...
1
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5
answer
114
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Identifying the space in commas with regular expression
I have a data separated by spaces, but one of the data has special format with commas.
For example:
A B C,D,E,F G H
The start of comma group is detected with "[^\s]+\,", and the end of the group is with "\,[^\s+]".
In this example, the comma group starts with "C," and ends with ",F". The number of...
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4
answer
668
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Is csv format regular grammar or context-free grammar?
I am currently writing a csv parser. The definition of csv format is given by RFC4180 which is defined by ABNF. So the definition of csv is absolutely a contex-free grammar. However, I would like to know if csv is regular grammar? So that I could parse it with just a finite state machine. Furthermor...
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In vs regular expressions for checking against a word blacklist — estimating expected production performance
I have many HTML pages in which I need to check the existence of blacklisted words. I know that the built-in in is much faster then regular expressions but here I'm trying to compare many in against a single regular expression.
Since
re.match() checks for a match only at the beginning of the string...
1
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1
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456
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Parse WHERE condition with regular expressions
I was wondering if anyone can help me with a regular expression - not my strongest point - to parse the WHERE part of a SQL statement. I need to extract the column names, either in "column" or "table.column" format. I'm using MySQL and PHP.
For example, parsing:
(table.column_a = '1') OR (table.colu...
1
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1
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45
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Regex - Last mention
I'm using a Regex expression to extract mentions: /\[email protected][a-z0-9_-]+/gi.
For the following string "Hi @andrew my username is @dan and I like cakes.", it will return : ['@andrew', '@dan']
What I would like is a Regex that get the last mention, with nothing after it:
"Hi @andrew my username is @dan and I...
1
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3
answer
43
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Minus sign breaking equation extraction
I'm trying to make a regular expression that extracts the numerical constants and operators from an equation.
For example, given the input X_1 + 1234 * 5678 + 2 (where X_1 isn't a constant, so it's ignored), I want to extract the 1234 * 5678 + 2.
I have a regular expression that works for the above...
9
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1
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re.sub(“.*”, “, ”(replacement)“, ”text") doubles replacement on Python 3.7
On Python 3.7 (tested on Windows 64 bits), the replacement of a string using the RegEx .* gives the input string repeated twice!
On Python 3.7.2:
>>> import re
>>> re.sub(".*", "(replacement)", "sample text")
'(replacement)(replacement)'
On Python 3.6.4:
>>> import re
>>> re.sub(".*", "(replacement)...
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0
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13
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iterate over file
I would like to iterate over a file and remove a series of lines that match a given regex. I have the script below but it only removes the 1st matching line/regex. How can i iterate through the file to get it to work?
import glob
import re
read_files = glob.glob("*.agr")
with open("out.txt", "w") as...
1
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1
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R string matching and replace
Starting with the string -theta[0] * x[0] * x[4] -theta[1] * x[1], I'd like capture theta[.] and replace with exp(theta[.]) giving the final result as:
-exp(theta[0]) * x[0] * x[4] -exp(theta[1]) * x[1]
How do I accomplish this in R?
I tried the following to test by matching between as as follows:
p
1
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2
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1.6k
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c++11 regex : check if a set of characters exist in a string
If for example, I have the string: "asdf{ asdf }",
I want to check if the string contains any character in the set []{}().
How would I go about doing this?
I'm looking for a general solution that checks if the string has the characters in the set, so that I can continue to add lookup characters in t...
1
votes
2
answer
3.4k
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extract English words from string in python
I have a document that each line is a string. It might contain digits, non-English letters and words, symbols(such as ! and *). I want to extract the English words from each line(English words are separated by space).
My code is the following, which is the map function of my map-reduce job. However,...
1
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1
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2k
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Get the word right before the coma with javascript and regex? [duplicate]
This question already has an answer here:
capturing group in regex
3 answers
Hi im trying to get the word right before the coma in a sentence.
For example if the string is:
"Cloudy, and 51 ° F "
I want the output CLOUDY.
How is this done in regex and javascript? I know you have to use the .match c...
1
votes
2
answer
470
Views
Oracle REGEXP_SUBSTR column names for PIVOT
I am working with PL/SQL Developer v10 on Oracle 11g database.
In our system we have a question and answer table that I need to 'flatten' for each customer per question answered.
One set of questions had specific code (PIFQ) in description of question that made the following script possible. Simply...
1
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2
answer
1.2k
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how to add ( ) brackets to characters after the first word in Notepad++
I need to put all the characters within brackets ( ) after the first word in a file,
for example:
g.setproperties "Title" "" "Comments" "" "UnitForce" "kN" "UnitLength" "m" "UnitTime" "s"
g.bh 0 0
to
g.setproperties ("Title" "" "Comments" "" "UnitForce" "kN" "UnitLength" "m" "UnitTime" "s")
g.bh...
1
votes
2
answer
71
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Find the last occurrence of the end of a word
I have a string and I'm trying to find the last occurrence of an end of a word. E.G.:
This is a test string and I need to find the last occurrence of a word. This sentence will be cut sho
^
I want to find the position of the space between cut and short
I've tried using the end of word character symb...