Regular expression syntax - REGEX

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Hi everyone,

I need mandatory filed regular expression syntax.

Please help any one.

What I have tried:

Am tried this one ^[\w]{1}$

But its allowed only one character. more than one character failed.

Posted 15-May-17 3:53am

rkganapathy

Updated 15-May-17 10:02am

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4 solutions

Solution 2

If you want one or more, then try

^[\w]{0,}$

Posted 15-May-17 4:53am

Ashish Mishra

Updated 15-May-17 4:55am

Comments

rkganapathy 16-May-17 2:24am

Its not working. show always true.

Solution 3

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[^]
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.[^]

Posted 15-May-17 10:02am

Patrice T

Solution 4

Finally ,

I got solution from this link

Regular Expressions to Check for Mandatory Fields[^]

Posted 16-May-17 3:02am

rkganapathy

Updated 16-May-17 3:05am

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OriginalGriff · Accepted Answer · 2017-05-15T04:19:00

Am tried this one ^[\w]{1}$

But its allowed only one character. more than one character failed.
That's because that is exactly what you told it to do: {1} means "exactly one of" - and is redundant, as is most of that Regex, which reduces to:

^\w$

If you want one or more, then try

^\w+$

If you want 4 then try

^\w{4}$

If you are going to play with regular expressions, get a copy of Expresso[^] - it's free, and it examines and generates Regexes.