Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations Rhinorhino on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!

bash string check 1

Status
Not open for further replies.
w5000

w5000

Technical User
Joined
Nov 24, 2010
Messages
223
Location
PL

Hello,
why test returns "clean" what is marked in red in belongs strings comparison?

Code: 
# d=274y82heE
# [[ $d =~ [^[:alnum:]] ]] && echo "not clean $d" || echo "clean $d"
[COLOR=#4E9A06]clean 274y82heE[/color]
# d=274y82he^E
# [[ $d =~ [^[:alnum:]] ]] && echo "not clean $d" || echo "clean $d"
[COLOR=#4E9A06]not clean 274y82he^E[/color]

# d=/one/ssfdsf/274y82he^E/end/end
# [[ $d =~ /one/ssfdsf/[^[:alnum:]]/end/end ]] && echo "not clean $d" || echo "clean $d"
[COLOR=#EF2929]clean /one/ssfdsf/274y82he^E/end/end[/color]
# [[ $d =~ /one/ssfdsf/[[:alnum:]]/end/end ]] && echo "not clean $d" || echo "clean $d"
[COLOR=#EF2929]clean /one/ssfdsf/274y82he^E/end/end[/color]
# [[ $d =~ ^/one/ssfdsf/[[:alnum:]]/end/end ]] && echo "not clean $d" || echo "clean $d"
[COLOR=#EF2929]clean /one/ssfdsf/274y82he^E/end/end[/color]
# [[ $d =~ ^/one/ssfdsf/[[:alnum:]]/end/end$ ]] && echo "not clean $d" || echo "clean $d"
[COLOR=#EF2929]clean /one/ssfdsf/274y82he^E/end/end[/color]
 
Sort by date Sort by votes
Hi

[ul]
[li][tt][[:alnum:]][/tt] - one alphanumeric character[/li]
[li][tt][^[:alnum:]][/tt] - one non-alphanumeric character[/li]
[/ul]
In that place you have 8 alphanumeric character, then 1 non-alphanumeric character, then 1 alphanumeric character.

Not sure what is your goal, but try something like this :
Bash: 
[[ $d =~ /one/ssfdsf/.*[^[:alnum:]].*/end/end ]]

Feherke.
feherke.ga
 
Upvote 0 Downvote
hello,

ok. but it doesn't return clean when I expect it clean:

Code: 
# d=/one/ssfdsf/274y82heE/end/end
# [[ $d =~ ^/one/ssfdsf/[[:alnum:]].*/end/end$ ]] && echo "not clean $d" || echo "clean $d"
not clean /one/ssfdsf/274y82heE/end/end

the goal is to check if there is "alnum" between ^/one/ssfdsf/ and /end/end$
 
Upvote 0 Downvote
Hi

Your current regular expression says :
[ul]
[li]starts with "/one/ssfdsf/"[/li]
[li]then 1 alphanumeric character[/li]
[li]then any number of any character[/li]
[li]ends with "/end/end"[/li]
[/ul]
As your current string looks exactly like that, so the 1st [tt]echo[/tt] gets executed, saying "not clean".

w5000 said:
the goal is to check if there is "alnum" between ^/one/ssfdsf/ and /end/end$
Click to expand...
Your current regular expression says in that place has to be 1 alnum followed by anything or nothing.

I think you want this, so in that place to have 1 or more alphanumeric characters :
Bash: 
[[ $d =~ ^/one/ssfdsf/[[:alnum:]]+/end/end$ ]] && echo "clean $d" || echo "not clean $d"


Feherke.
feherke.ga
 
Upvote 0 Downvote
thx.
indeed, I was pretty sure I had tested [[:alnum:]]+ in one of my first tries... I must had done some mistake
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

g33man
  • Locked
  • Article Article
BASH script - array problem
Replies
1
Views
680
feherke
feherke
grazinggoat2
  • Locked
  • Question Question
why cant i expand filenames in bash
Replies
2
Views
635
grazinggoat2
grazinggoat2
admoore
  • Locked
  • Question Question
sed substitution within bash script with mixed quotes
Replies
1
Views
675
feherke
feherke
Samer Haddad
  • Locked
  • Question Question
running tcsh inside bash shell
Replies
1
Views
365
SamBones
SamBones
SamBones
  • Locked
  • Question Question
bash read Frustration
Replies
2
Views
546
SamBones
SamBones

Part and Inventory Search

Sponsor

Back
Top