regex - Regular expression with alpha, hyphens, underscore and dots characters -


i've wrote regex: 

/^[a-za-z\-\_\. ]{2,60}$/

it work fine-ish allows --- or ___ or ... or -_. entered input (without 2 alpha @ least) , don't want that. instance can have -aa, a-a, aa--- (similarly other characters).

the requirement there should @ least 2 alpha in string, , hyphens , other 2 non-alpha symbols mentioned can anywhere inside string.

use

/^(?=(?:[^a-za-z]*[a-za-z]){2})[-_. a-za-z]{2,60}$/

see regex demo

details:

  • ^ - start of string
  • (?=(?:[^a-za-z]*[a-za-z]){2}) - @ least 2 alpha chars in string (that is, there must 2 consecutive occurrences of:
    • [^a-za-z]* - 0 or more chars other ascii letters
    • [a-za-z] - ascii letter)
  • [-_. a-za-z]{2,60} - 2 60 occurrences of allowed chars
  • $ - end of string

note not need escape - if @ start/end of character class. _ word char, no need escaping anywhere. . not need escaping inside character class.

to tell regex engine limit ., _ , - chars max 10 in string, add (?!(?:[^._-]*[._-]){11}) negative lookahead after ^ anchor:

/^(?!(?:[^._-]*[._-]){11})(?=(?:[^a-za-z]*[a-za-z]){2})[-_. a-za-z]{2,60}$/

Comments

Post a Comment

Popular posts from this blog

php - Vagrant up error - Uncaught Reflection Exception: Class DOMDocument does not exist -

i've set bento/ubuntu-16.04 vagrant box using php 5.6, , getting following error quite few times when try , run shell script: "uncaught reflection exception: class domdocument not exist". i've tried adding following top of script (not together), each no success: "sudo apt-get install php5.6-xml", "sudo apt-get install php5-xml", "sudo apt-get install php-dom" i've tried resetting server "sudo service apache2 restart". does have suggestions?
Read more

vue.js - Create hooks for automated testing -

Image
qa guys complained can't automate frontend testing. because our html looks same outside. lazy hack did this <template> <div :role="$options.name"> ... </div> </template> <script> export default { name: 'vmcomponentname' } </script> which takes name script , applies html. in browser get: <div role="vmcomponentname"> ... </div> line :role="$options.name" goes in every component. is there dry er solutions? please share. additional details i'll explain in details looking for. imagine have vmusercreate form creates user. test case can create user . to automatically test without role, have use following selector: .wrapper > .wrapper > .wrapper > .submit-button the test extremely brittle (will break lot). if use roles can use [role="vmusercreateform"] .submit-button selector. many folds less brittle. so basically, i'm ...
Read more

Add new key value to json node in java -

i have json file : { "id":1, "name":"abc", "addressdetails": { "city":"newyork" } } i wanted add 1 more key-value ("pincode" : "414141") node 'addressdetails'. i tried using : objectmapper mapper = new objectmapper(); jsonnode root = mapper.readtree(new file("d://test.json")); objectnode node = mapper.createobjectnode(); node.with("addressdetails").put("pincode", "414141"); but it's not getting added, there way can ? you can try you should modify file path objectmapper mapper = new objectmapper(); objectnode nodes = mapper.readvalue(new file("d:\\test.txt"), objectnode.class); nodes.with("addressdetails").put("pincode", "414141"); mapper.writer().writevalue(new file("d:\\test.txt"), nodes);
Read more