Modification of java regex

Question

I was using the below regex to substitute file names

Regex -> .*\/([A-Z0-9_]{1,9})_(O).*.cmd
Substitution -> $1

The file names were like below:

File Name                         | Substituted Name
---------------------------------- ------------------
/V3/OGM_REC_Offline_Level0_4D.cmd  OGM_REC
/V2/PIE_PROD_Online_Level1_6D.cmd  PIE_PROD
/V3/BR2_OnDemand.cmd               BR2
/opt/STING_Online_Inc0_1W.cmd      STING

Then the files changed and I modified the regex

Regex -> .*\/([A-Z0-9_]{1,9})(_O|Full).*.cmd
Substitution -> $1

Additional new file names

File Name             | Substituted Name
---------------------- ------------------
/opt/RSU10Full.cmd     RSU10
/V4/REZ40_1Full.cmd    REZ40_1

Now, it seems there are new files are getting updated with below name formats

/app/OMGIT_FullOnDemand_4W.cmd
/admin/FOC_STG_Full_6D.cmd

I've modified the regex again, but it's not getting successful

Regex -> .*\/([A-Z0-9_]{1,9})(_O|Full|_Full).*.cmd
Substitution -> $1

@stribizhev , Shouldn't you post this as an answer ? I've tested it and it's working for the examples that I have... I'll be doing a extensive tests using this on Monday... Thanks for your quick reply... — Marcos
– Marcos, Commented Nov 20, 2015 at 11:29

Wiktor Stribiżew · Accepted Answer · 2015-11-20 11:33:51Z

1

I suggest using a version with a lazy limiting quantifier {1,9}? and optional _:

.*/([A-Z0-9_]{1,9}?)(_O|_?Full).*[.]cmd

This way, we match as few characters with [A-Z0-9_]{1,9}? as possible to return a valid captured subtext, and _?Full part can hold the optional underscore.

See the regex demo

answered Nov 20, 2015 at 11:33

Wiktor Stribiżew

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Wiktor Stribiżew Over a year ago

If you get more complicated patterns on Monday, feel free to come back here.

liquid_code · Accepted Answer · 2015-11-23 10:57:04Z

0

I've noticed that unnecessary tail is allways started with: (optional) _, letter in uppercase, letter in lowercase. So, universal solution is:

.*\/([^a-z]*?)[_]?[A-Z][a-z].*

edited Nov 23, 2015 at 10:57

answered Nov 20, 2015 at 12:05

liquid_code

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