Question 49890 in Javascript Question posted in
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Regular expression for pattern which has fixed starting string then some pattern and total length should be 14 – Javascript

I want to disable button if entered string is not like G6A123-4853473

Validation conditions :
string should start with G6
After that it should contain one or more alphabets
and should contain one hyphen (-) , hyphen should not be on last position
and total length of string should be 14

I am using angular , I have tried this ^([G6][A-Z]*[0-9]*[-][0-9]*)$

<input matInput type="search" #filter>
<button mat-raised-button color="primary" [disabled]="!filter.value.match('^([8D][A-Z]*[0-9]*[-][0-9]*)$')"> Search 
</button>

The problem in this are

  1. It can not validate string length.
  2. hyphen can be in last position
Tags:

2

Answers


  1. 0

    You can use lookahead to validate string length:

    ^(?=.{14}$)G6(?=.*[A-Z])[A-Z0-9]+-[A-Z0-9]+

    It requires that after beginning of the string there are 14 symbols and end of the string.

    (?=.*[A-Z]) requires presence of upper letter somewhere after G6.

    Also, to check that there are digits after hyphen you can use + qualifier.

    Demo here.

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  2. 0

    Try once,

    ^abc([a-zA-Z0-9]+)$

    OR

    ^G6[A-Za-z]+-[A-Za-z0-9]{7}$

    This regular expression will match any string that starts with "abc" and is followed by one or more alphanumeric characters.

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