RegEx help

[ale1981]

Can somebody help me with this RegEx expression?

I have tried but can't seem to get it to work, what I need is to verify a string, the string can only contain these characters ( C, X, J, P, L, B ) and numbers but must also be in this format;

[char][number][space][char][number]......

e.g.

C1 X4 B1

C3

 

Is this something RegEx can do?

 

Thanks in advance.

Edited October 27, 2014 by ale1981

[jguinch]

$string = "C1 X4 B1"
; $string = "C1 X4 B1 X9 J0"
If StringRegExp($string, "^([BCJLPX]\d)( [BCJLPX]\d)*$") Then ConsoleWrite("ok")

Match

C1 X4 B1

C1 X4 B1 X9 J0

Edited October 27, 2014 by jguinch

[mikell]

$string = "C3"
 ;$string = "C1 X4 B1 X9 J0"
 ;$string = "C1a"
 If StringRegExp($string, "^([BCJLPX]\d(?=\h|$))+") Then ConsoleWrite("ok")

Strictly following the requirements

Edited October 27, 2014 by mikell

[kylomas]

@mikell - The h is for the space?

[jguinch]

@mikell : $string = "C1 CC CC CC" returns OK with your code.

BTW, I did not use h but a space instead (because TAB should not match)   

[kylomas]

Why doesn't this work...

If StringRegExp($string, "^([BCJLPX]\d)( \1)*$") Then ConsoleWrite("ok")

"1" referring back to the first captured group.

[jguinch]

@kylomas : your expression matches something like C1 C1 C1 C1 only (where 1 is the group value, not the expression). Use (?1) instead if 1 :

If StringRegExp($string, "^([BCJLPX]\d)( (?1))*$") Then ConsoleWrite("ok")

Edited October 27, 2014 by jguinch

[mikell]

kylomas,

h is for any horizontal white space, in this case "space" is not well defined so let's assume that it may be a chr(32) as well as a horizontal tab

@jguinch

Thus "TAB should not match" is not sure 

If not StringRegExpReplace($string, "[BCJLPX]\d(?:\h+|$)", "") Then ConsoleWrite("ok")

Edited October 27, 2014 by mikell

[ale1981]

 

@kylomas : your expression matches something like C1 C1 C1 C1 only (where 1 is the group value, not the expression). Use (?1) instead if 1 :

If StringRegExp($string, "^([BCJLPX]\d)( (?1))*$") Then ConsoleWrite("ok")

 

Thanks jguinch that worked

[kylomas]

@jguinch - Thanks, I was telling it to match the value captured when I meant to repeat the expression, DOH!

edit:

@mikell - Thanks...

Edited October 27, 2014 by kylomas