Recent questions tagged Regex

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regex - What does ?= mean in a regular expression?

May I know what ?= means in a regular expression? For example, what is its significance in this expression: (?=.*d). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - How to do sed like text replace with python?

I would like to enable all apt repositories in this file cat /etc/apt/sources.list ## Note, this file is written ... "pythonic") way to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - apache HTTP:X-Forwarded-Proto in .htaccess is causing redirect loop in dev environment

I've had to update my .htaccess from this: RewriteCond %{HTTPS} !=on RewriteRule ^ https://%{HTTP_HOST ... work correctly in both environments? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Case insensitive search in Mongo

I am using a case insensitive search in Mongo, something similar to https://stackoverflow.com/q/5500823/1028488. ... away. Thanks in advance See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Regular Expression to reformat a US phone number in Javascript

I'm looking to reformat (replace, not validate - there are many references for validating) a phone number for ... following: (123) 456-7890 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - How to replace a whole line with sed?

Suppose I have a file with lines aaa=bbb Now I would like to replace them with: aaa=xxx I can do that as ... [something] with aaa=xxx using sed? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Search and replace in bash using regular expressions

I've seen this example: hello=ho02123ware38384you443d34o3434ingtod38384day echo ${hello//[0-9]/} Which follows this ... using full regex syntax? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - replace a part of a string with REGEXP in sqlite3

I installed REGEX support with apt-get install sqlite3 sqlite3-pcre now I can use REGEX in my queries on the ... an sqlite query using regex? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - regular expression capture nth match

Is there any way to, using regular expression, return the nth occurrence? I did search the forums and only found ... element I want)? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - PHP regular expression to match lines starting with a special character

I have a text file with some configuration value. There a comment starts with a # I am trying to find a ... empty array. Anyone can help? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Does MySQL Regexp support Unicode matching

Does anyone know if Mysql's regexp supports unicode? I've been doing some research and the majority of blogs etc. ... if my text is unicode. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Match URL pattern in PHP using a regular expression

I want to match a URL link in a wall post and replace this link with anchor tag. For this I use ... patternS with a single regular expression? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - How to replace " " with " \ " in java

I tried to break the string into arrays and replace with \ , but couldn't do it, also I tried String.replaceAll ... it reads only in this way. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - JavaScript regular expression exception (Invalid group)

I have the following regular expression: /(?<={index:)d+(?=})/g I am trying to find index integer in strings ... What do I need to fix? Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Regular Expression to get the SRC of images in C#

I'm looking for a regular expression to isolate the src value of an img. (I know that this is not the best way to do ... (<img([^>]+)>)").Value; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Understanding positive and negative lookaheads

I'm trying to understand how negative lookaheads work on simple examples. For instance, consider the following regex: a( ... in this demo. Why? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - How to delete everything after nth delimiter in R?

I have this vector myvec. I want to remove everything after second ':' and get the result. How do ... chr2:213403244 chr7:55240586 chr7:55241607 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Validate mathematical expressions using regular expression?

I want to validate mathematical expressions using regular expression. The mathematical expression can be this It can be ... Please help me out. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Complete word matching using grepl in R

Consider the following example: > testLines <- c("I don't want to match this","This is what I want to match" ... I'm looking for is FALSE TRUE. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - PHP using preg_replace : "Delimiter must not be alphanumeric or backslash" error

I am trying to take a string of text like so: $string = "This (1) is (2) my (3) example (4) text" ... enough to switch it over to this example. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - How do I use a new-line replacement in a BSD sed?

Greetings, how do I perform the following in BSD sed? sed 's/ / /g' From the man-page it states that will ... may install fink to get GNU sed. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Have HTML5's a inputs pattern attribute ignore case

I need to have HTML's input elements pattern ignore the case of the value, like have if the regex is /[a-z] ... ;/, but that was an example.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Python regular expressions OR

Suppose I want a regular expression that matches both "Sent from my iPhone" and "Sent from my iPod". How do I ... ) but doesn't seem to work. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - replace a unknown string between two known strings with sed

I have a file with the following contents: WORD1 WORD2 WORD3 How can I use sed to replace the string between WORD1 ... .*WORD3/foo/g' file.txt See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - remove unicode emoji using re in python

I tried to remove the emoji from a unicode tweet text and print out the result in python 2.7 using myre = re.compile(u'[ ... ' //./ ! # # # See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Javascript split string on space or on quotes to array

var str = 'single words "fixed string of words"'; var astr = str.split(" "); // need fix I would like the ... "words", "fixed string of words"]; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

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regex - Remove numbers from alphanumeric characters

I have a list of alphanumeric characters that looks like: x <-c('ACO2', 'BCKDHB456', 'CD444') I would like the ... .., ), class = "factor") See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.6k views

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regex - Passing a function to re.sub in Python

I have strings that contain a number somewhere in them and I'm trying to replace this number with their word notation ... way to do what I want? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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