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Forcing regex to ignore detection depending on preposition
A comprehensive regex for phone number validationIs there a regular expression to detect a valid regular expression?How to negate specific word in regex?RegEx match open tags except XHTML self-contained tagsJS Regex, how to replace the captured groups only?Replace only some groups with RegexA regex not working with grepRegEx doesn't work with .NET, but does with other RegEx implementationsRegex pattern to detect a link but not an imageSwift extract regex matches
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;
I'm trying to build a regex, which will detect usernames mentioned in a string. The usernames can look like "username", "username[0-9]", "adm-username", "adm-username[0-9]".
As of now, I have this: b(adm-)0,1username[0-9]0,1b (link: https://regexr.com/4at34)
The problem is with adm-. If the preposition is aadm-username, the regex still detects 'username', I want it to fail. Any tips how to do that?
Thanks
regex
asked Mar 25 at 6:48
JliskJlisk
586
add a comment |
I'm trying to build a regex, which will detect usernames mentioned in a string. The usernames can look like "username", "username[0-9]", "adm-username", "adm-username[0-9]".
As of now, I have this: b(adm-)0,1username[0-9]0,1b (link: https://regexr.com/4at34)
The problem is with adm-. If the preposition is aadm-username, the regex still detects 'username', I want it to fail. Any tips how to do that?
Thanks
regex
asked Mar 25 at 6:48
JliskJlisk
586
You want to match any username only withadm-prefix or with no prefix?
– Michał Turczyn
Mar 25 at 6:57
add a comment |
I'm trying to build a regex, which will detect usernames mentioned in a string. The usernames can look like "username", "username[0-9]", "adm-username", "adm-username[0-9]".
As of now, I have this: b(adm-)0,1username[0-9]0,1b (link: https://regexr.com/4at34)
The problem is with adm-. If the preposition is aadm-username, the regex still detects 'username', I want it to fail. Any tips how to do that?
Thanks
regex
asked Mar 25 at 6:48
JliskJlisk
586
I'm trying to build a regex, which will detect usernames mentioned in a string. The usernames can look like "username", "username[0-9]", "adm-username", "adm-username[0-9]".
As of now, I have this: b(adm-)0,1username[0-9]0,1b (link: https://regexr.com/4at34)
The problem is with adm-. If the preposition is aadm-username, the regex still detects 'username', I want it to fail. Any tips how to do that?
Thanks
regex
regex
asked Mar 25 at 6:48
JliskJlisk
586
asked Mar 25 at 6:48
JliskJlisk
586
asked Mar 25 at 6:48
JliskJlisk
586
asked Mar 25 at 6:48
JliskJlisk
586
asked Mar 25 at 6:48
JliskJlisk
586
586
You want to match any username only withadm-prefix or with no prefix?
– Michał Turczyn
Mar 25 at 6:57
add a comment |
You want to match any username only withadm-prefix or with no prefix?
– Michał Turczyn
Mar 25 at 6:57
You want to match any username only with
adm- prefix or with no prefix?– Michał Turczyn
Mar 25 at 6:57
You want to match any username only with
adm- prefix or with no prefix?– Michał Turczyn
Mar 25 at 6:57
add a comment |
1 Answer
1
active
oldest
votes
You could replace b by [w-] in your case.
Also, don't match the boundaries.
And finally, don't match intermediate groups, make a single big group for your matches.
Demo
(?<![w-])((?:adm-)0,1username[0-9]0,1)(?![w-])
[v] username
[v] username2
[v] adm-username
[v] adm-username2
[x] aadm-username
[x] aadm-username2
Explanation
(?<![w-]) # negative lookbehind, only match if no word character or hyphen is present
(
(?:adm-)0,1 # non-matching group containing adm- literally once or none, will be matched in the greater group
username[0-9]0,1 # literally matching username and a digit, once or none
)
(?![w-]) # negative lookahead, only match if no word character or hyphen is present
answered Mar 25 at 6:59
Yassin HajajYassin Hajaj
15.1k83062
Would you mind to 'dissect' the regex with me? Just to see if I understand it correctly. (?<![w-]) -- must not have a word ending with - in front of it. ((?:adm-)0,1 -- checks if the group contains adm-? Not sure about this part. username[0-9]0,1) -- matching the username itself. (?![w-]) -- must not have a word behind itself.
– Jlisk
Mar 25 at 7:33
1
@Jlisk Sure, I'll do it later within the day if you don't mind
– Yassin Hajaj
Mar 25 at 8:25
1
@Jlisk I added a little bit of explanation
– Yassin Hajaj
Mar 25 at 12:16
Thank you for expanding the answer. About not matching the boundaries, I take it it is better to use lookahead/lookbehind to detect end of the word?
– Jlisk
Mar 26 at 5:32
add a comment |
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1 Answer
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active
oldest
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You could replace b by [w-] in your case.
Also, don't match the boundaries.
And finally, don't match intermediate groups, make a single big group for your matches.
Demo
(?<![w-])((?:adm-)0,1username[0-9]0,1)(?![w-])
[v] username
[v] username2
[v] adm-username
[v] adm-username2
[x] aadm-username
[x] aadm-username2
Explanation
(?<![w-]) # negative lookbehind, only match if no word character or hyphen is present
(
(?:adm-)0,1 # non-matching group containing adm- literally once or none, will be matched in the greater group
username[0-9]0,1 # literally matching username and a digit, once or none
)
(?![w-]) # negative lookahead, only match if no word character or hyphen is present
answered Mar 25 at 6:59
Yassin HajajYassin Hajaj
15.1k83062
Would you mind to 'dissect' the regex with me? Just to see if I understand it correctly. (?<![w-]) -- must not have a word ending with - in front of it. ((?:adm-)0,1 -- checks if the group contains adm-? Not sure about this part. username[0-9]0,1) -- matching the username itself. (?![w-]) -- must not have a word behind itself.
– Jlisk
Mar 25 at 7:33
1
@Jlisk Sure, I'll do it later within the day if you don't mind
– Yassin Hajaj
Mar 25 at 8:25
1
@Jlisk I added a little bit of explanation
– Yassin Hajaj
Mar 25 at 12:16
Thank you for expanding the answer. About not matching the boundaries, I take it it is better to use lookahead/lookbehind to detect end of the word?
– Jlisk
Mar 26 at 5:32
add a comment |
You could replace b by [w-] in your case.
Also, don't match the boundaries.
And finally, don't match intermediate groups, make a single big group for your matches.
Demo
(?<![w-])((?:adm-)0,1username[0-9]0,1)(?![w-])
[v] username
[v] username2
[v] adm-username
[v] adm-username2
[x] aadm-username
[x] aadm-username2
Explanation
(?<![w-]) # negative lookbehind, only match if no word character or hyphen is present
(
(?:adm-)0,1 # non-matching group containing adm- literally once or none, will be matched in the greater group
username[0-9]0,1 # literally matching username and a digit, once or none
)
(?![w-]) # negative lookahead, only match if no word character or hyphen is present
answered Mar 25 at 6:59
Yassin HajajYassin Hajaj
15.1k83062
Would you mind to 'dissect' the regex with me? Just to see if I understand it correctly. (?<![w-]) -- must not have a word ending with - in front of it. ((?:adm-)0,1 -- checks if the group contains adm-? Not sure about this part. username[0-9]0,1) -- matching the username itself. (?![w-]) -- must not have a word behind itself.
– Jlisk
Mar 25 at 7:33
1
@Jlisk Sure, I'll do it later within the day if you don't mind
– Yassin Hajaj
Mar 25 at 8:25
1
@Jlisk I added a little bit of explanation
– Yassin Hajaj
Mar 25 at 12:16
Thank you for expanding the answer. About not matching the boundaries, I take it it is better to use lookahead/lookbehind to detect end of the word?
– Jlisk
Mar 26 at 5:32
add a comment |
You could replace b by [w-] in your case.
Also, don't match the boundaries.
And finally, don't match intermediate groups, make a single big group for your matches.
Demo
(?<![w-])((?:adm-)0,1username[0-9]0,1)(?![w-])
[v] username
[v] username2
[v] adm-username
[v] adm-username2
[x] aadm-username
[x] aadm-username2
Explanation
(?<![w-]) # negative lookbehind, only match if no word character or hyphen is present
(
(?:adm-)0,1 # non-matching group containing adm- literally once or none, will be matched in the greater group
username[0-9]0,1 # literally matching username and a digit, once or none
)
(?![w-]) # negative lookahead, only match if no word character or hyphen is present
answered Mar 25 at 6:59
Yassin HajajYassin Hajaj
15.1k83062
You could replace b by [w-] in your case.
Also, don't match the boundaries.
And finally, don't match intermediate groups, make a single big group for your matches.
Demo
(?<![w-])((?:adm-)0,1username[0-9]0,1)(?![w-])
[v] username
[v] username2
[v] adm-username
[v] adm-username2
[x] aadm-username
[x] aadm-username2
Explanation
(?<![w-]) # negative lookbehind, only match if no word character or hyphen is present
(
(?:adm-)0,1 # non-matching group containing adm- literally once or none, will be matched in the greater group
username[0-9]0,1 # literally matching username and a digit, once or none
)
(?![w-]) # negative lookahead, only match if no word character or hyphen is present
answered Mar 25 at 6:59
Yassin HajajYassin Hajaj
15.1k83062
edited Mar 25 at 12:15
answered Mar 25 at 6:59
Yassin HajajYassin Hajaj
15.1k83062
answered Mar 25 at 6:59
Yassin HajajYassin Hajaj
15.1k83062
answered Mar 25 at 6:59
Yassin HajajYassin Hajaj
15.1k83062
15.1k83062
Would you mind to 'dissect' the regex with me? Just to see if I understand it correctly. (?<![w-]) -- must not have a word ending with - in front of it. ((?:adm-)0,1 -- checks if the group contains adm-? Not sure about this part. username[0-9]0,1) -- matching the username itself. (?![w-]) -- must not have a word behind itself.
– Jlisk
Mar 25 at 7:33
1
@Jlisk Sure, I'll do it later within the day if you don't mind
– Yassin Hajaj
Mar 25 at 8:25
1
@Jlisk I added a little bit of explanation
– Yassin Hajaj
Mar 25 at 12:16
Thank you for expanding the answer. About not matching the boundaries, I take it it is better to use lookahead/lookbehind to detect end of the word?
– Jlisk
Mar 26 at 5:32
add a comment |
Would you mind to 'dissect' the regex with me? Just to see if I understand it correctly. (?<![w-]) -- must not have a word ending with - in front of it. ((?:adm-)0,1 -- checks if the group contains adm-? Not sure about this part. username[0-9]0,1) -- matching the username itself. (?![w-]) -- must not have a word behind itself.
– Jlisk
Mar 25 at 7:33
1
@Jlisk Sure, I'll do it later within the day if you don't mind
– Yassin Hajaj
Mar 25 at 8:25
1
@Jlisk I added a little bit of explanation
– Yassin Hajaj
Mar 25 at 12:16
Thank you for expanding the answer. About not matching the boundaries, I take it it is better to use lookahead/lookbehind to detect end of the word?
– Jlisk
Mar 26 at 5:32
Would you mind to 'dissect' the regex with me? Just to see if I understand it correctly. (?<![w-]) -- must not have a word ending with - in front of it. ((?:adm-)0,1 -- checks if the group contains adm-? Not sure about this part. username[0-9]0,1) -- matching the username itself. (?![w-]) -- must not have a word behind itself.
– Jlisk
Mar 25 at 7:33
Would you mind to 'dissect' the regex with me? Just to see if I understand it correctly. (?<![w-]) -- must not have a word ending with - in front of it. ((?:adm-)0,1 -- checks if the group contains adm-? Not sure about this part. username[0-9]0,1) -- matching the username itself. (?![w-]) -- must not have a word behind itself.
– Jlisk
Mar 25 at 7:33
1
1
@Jlisk Sure, I'll do it later within the day if you don't mind
– Yassin Hajaj
Mar 25 at 8:25
@Jlisk Sure, I'll do it later within the day if you don't mind
– Yassin Hajaj
Mar 25 at 8:25
1
1
@Jlisk I added a little bit of explanation
– Yassin Hajaj
Mar 25 at 12:16
@Jlisk I added a little bit of explanation
– Yassin Hajaj
Mar 25 at 12:16
Thank you for expanding the answer. About not matching the boundaries, I take it it is better to use lookahead/lookbehind to detect end of the word?
– Jlisk
Mar 26 at 5:32
Thank you for expanding the answer. About not matching the boundaries, I take it it is better to use lookahead/lookbehind to detect end of the word?
– Jlisk
Mar 26 at 5:32
add a comment |
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You want to match any username only with
adm-prefix or with no prefix?– Michał Turczyn
Mar 25 at 6:57