This question already has answers here:
Match exact string
(3 answers)
Closed 4 years ago.
I have the following regex for a string which starts by a + and having numbers only:
PatternArticleNumber = $"^(\\+)[0-9]*";
However this allows strings like :
+454545454+4545454
This should not be allowed. Only the 1st character should be a +, others numbers only.
Any idea what may be wrong with my regex?
You can probably workaround this problem by just adding an ending anchor to your regex, i.e. use this:
PatternArticleNumber = $"^(\\+)[0-9]*$";
Demo
The problem with your current pattern is that the ending is open. So, the string +454545454+4545454 might appear to be a match. In fact, that entire string is not a match, but the engine might match the first portion, before the second +, and report a match.
Related
This question already has answers here:
Regular Expression to get a string between parentheses in Javascript
(10 answers)
Closed 2 years ago.
I used
let regExp = /\(([^)]+)\)/;
to extract
(test(()))
from
aaaaa (test(())) bbbb
but I get only this
(test(()
How can I fix my regex ?
Don't use a negative character set, since parentheses (both ( and )) may appear inside the match you want. Greedily repeat instead, so that you match as much as possible, until the engine backtracks and finds the first ) from the right:
console.log(
'aaaaa (test(())) bbbb'
.match(/\(.*\)/)[0]
);
Keep in mind that this (and JS regex solutions in general) cannot guarantee balanced parentheses, at least not without additional post-processing/validation.
This question already has an answer here:
Reference - What does this regex mean?
(1 answer)
Closed 3 years ago.
Is there anyone who can help me to get the marked pieces out of this file (see image below) with a regular expression? As you can see, it's difficult because the length is not always the same and the part before my goal is sometimes broken down and sometimes not.
Thank you in advance.
Text:
:61:200106D48,66NDDTEREF//00060100142533
/TRCD/01028/
:86:/EREF/SLDD-0705870-5658387529//MARF/11514814-001//CSID/NL59ZZZ390
373820000//CNTP/NL96ABNA0123456789/ABCANL2A/XXXXXXX123///REMI/UST
D//N00814760/
:61:200106D1840,55NDDTEREF//00060100142534
/TRCD/01028/
:86:/EREF/SLDD-0705869-5658387528//MARF/11514814-001//CSID/NL59ZZZ390
373820000//CNTP/NL96ABNA0123456789/ABCANL2A/XXX123XXXX///REMI/UST
D//N00814759/
:61:200106C236,31NTRFEREF//00060100142535
/TRCD/00100/
:86:/EREF/05881000010520//CNTP/NL19INGB0123456789/ABCBNL2A/XX123XXXX//
/REMI/USTD//KLM REF 1000000022/
The length is not always the same but it does not really matter in your case. You can check for a particular pattern at the end of a string.
(?<=\/\/)([\u2022a-zA-Z0-9]+)(?=\/$)
this regex will look for a string of caracter containing bullet (•), numbers, letters (uppercase and lowercase), that followes two front slash (//) and is followed by a slash (/) and the end of the string ( $ ).
You can test more cases here
This question already has answers here:
Regex Match all characters between two strings
(16 answers)
Closed 5 years ago.
I have files names in the below format -
India_AP_Dev1.txt
USA_GA_QA2.txt
USA_NY_AWSDev1.txt
AUS_AA_BB_QA4.txt
I want to extract only the environment part from the file name i.e. Dev1, QA2, AWSDev1, QA4etc. How can I go about with this type of file names. I thought about substring but the environment length is not constant. Is it possible to do it with regex
Appreciate your help. TIA
It is definitely possible using lookarounds:
(?<=_)[^._]*(?=\.)
(?<=_) match is preceded by _
[^._] take all characters except . and _
(?=\.) match is followed by .
Demo
This question already has answers here:
What special characters must be escaped in regular expressions?
(13 answers)
Closed 5 years ago.
I want to get the time in the following line. I want to get the string
2017-07-07 08:30:00.065156
in
[ID] = 0,[Time] = 2017-07-07 08:30:00.065156,[access]
I tried this
(?<=[Time] = )(.*?)(?=,)
Where i want to get the string in-between the time tag and the first comma but this doesn't work.
[Time] inside a regex means a T, an i, an m, or an e, unless you escape your square brackets.
You can drop the reluctant quantifier if you use [^,]* in place of .*:
(?<=\[Time\] = )([^,]*)(?=,)
This question already has answers here:
Need a regex to exclude certain strings
(6 answers)
Closed 9 years ago.
I have a string:
Input:
"Feature.. sklsd " AND klsdjkls 9290 "Feass . lskdk SDFSD __ ksdljsklfsd" NOT "Feuas" "Feature.lskd" OR PUT klasdkljf al9- .s.a, 9a0sd90209 .a,sdklf jalkdfj al;akd
I need to match any character except OR, NOT, AND, "Feature.any_count_of_characters"
the last one is important this start with: "Feature.
This is followed by any number of characters and then ends with: " character.
I'm trying to solve this using lookahead or lookbehind but I can get the expected output, only a portion of characters that I don't want.
My expected output is
"Feature.. sklsd " AND klsdjkls 9290 "Feass . lskdk SDFSD __ ksdljsklfsd" NOT "Feuas" "Feature.lskd" OR PUT klasdkljf al9- .s.a, 9a0sd90209 .a,sdklf jalkdfj al;akd
All that is in black.
To test it i'm using these links:
http://gskinner.com/RegExr/
http://regexpal.com/
Thanks.
EDIT
Check this link http://regexr.com?37v36
inside the link i get matched some expression. But i don't need the expression that matched. i need the inverse, how i can get it?
Thanks.
Just use
\s*(?:AND|OR|NOT|"[^"]+")\s*
but do a replace operation. That will leave what you want.
Your basic problem is that look behinds can not have arbitrary lengths, but you need that. There are work arounds, but a simpler approach is to use a capturing group:
"Feature\.[^"]*" (?:OR|NOT|AND) ([^"])
And your target will be in group 1 of the match.