Regular expressing for the following string

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I have string with is having the alpha numeric noted as below.

Ex 1: abc1232323acvc23232avac
Ex 2: abc1232bcsb

Here I want to check the string is alpha number as well as continuous numeric length should not exceed more than 7.

I have tried but I couldn't get the proper regular expression.

Kindly help me on this

What I have tried:

Tried with

(([a-z]+[0-9]+)+|(([0-9]+[a-z]+)+))[0-9a-z]{0.7}*

Posted 21-Aug-17 18:44pm

@BangIndia

Updated 22-Aug-17 16:08pm

PIEBALDconsult

v2

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Patrice T · Answer 1 · 2017-08-21T21:04:00

Your RegEx is weird, replace {0.7} with {0,7} to control repeat. The * at the end is an error too.
Use last link to see a nice diagram of your RegEx, it may help to anderstand what is wrong.

Just a few interesting links to help building and debugging RegEx.
Here is a link to RegEx documentation:
perlre - perldoc.perl.org[^]
Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[^]
Expresso Regular Expression Tool[^]
RegExr: Learn, Build, & Test RegEx[^]
This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx:
Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]