Restrict input to a certain pattern

Question

I am creating an aplication in javaScript, but I am a bit confused of RegExp. I need to make user type into textArea desired form of string and let aplication to work with it, so I need to restrict the textArea input.

I need to field be like this: 760, 8,20, 50/3, 10,160/40, 3001

with optional spaces after comma, and optional number of items, where some of them can be optionaly with sufix (*/1...)

also i would like to have similar pattern which behave simillary but there could be prefixes like this:

st. 760,st. 8, st.20, st. 50/3, st. 10, st. 160/40, st. 3001

also with optional spaces. I would be really happy if someone could help me with making this regExp, because I am a real begginer in creating this...

I've tried the following regex ((\d+)|((\d+)/(\d+))),(\s?).

Thanks in advance!

i tried something like this: ((\d+)|((\d+)/(\d+))),(\s?) but i think it doesn't cover whole problem... — Hokyjack
– Hokyjack, Commented Jul 29, 2013 at 9:52
@user2567998 Well you can always test your regex at regexpal. — HamZa
– HamZa, Commented Jul 29, 2013 at 9:58

cgledezma · Accepted Answer · 2013-07-29 11:05:56Z

1

I would use something like this:

^\d+(/\d+)?(\s*,\s*\d+(/\d+)?)*$

Then, for the second one:

^(st\.\s*)?\d+(/\d+)?(\s*,\s*(st\.\s*)?\d+(/\d+)?)*$

Remember, any time you can use the escape sequences, which will make your regex much clearer. So, instead of doing [0-9], use \d, and also use \s to accept all kinds of spaces (space, tab; etc).

answered Jul 29, 2013 at 11:05

cgledezma

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1 Comment

Hokyjack Over a year ago

this one is great! i slightly edited it: /^(st\.\s*)?\d+(\/\d+)?(\s*,\s*(st\.\s*)?\d+(\/\d+)?)*$/im but it is exacly what I needed! thanks for taking your time and helping me!

Ofir · Accepted Answer · 2013-07-29 10:45:48Z

1

I think

^([ ]*[0-9]+(/[0-9]+)?[ ]*\,)*([ ]*[0-9]+(/[0-9]+)?[ ]*)$

and

^([ ]*(st\. )?[0-9]+(/[0-9]+)?[ ]*\,)*([ ]*(st\. )?[0-9]+(/[0-9]+)?[ ]*)$

sound about right

edited Jul 29, 2013 at 10:45

answered Jul 29, 2013 at 9:51

Ofir

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3 Comments

Hokyjack Over a year ago

it looks pretty great, however when i type something like this: st. 760, gfn, st. 8 it also accepts this one, but i need to prevent to user write other symbols than digits (exept "st.")

Ofir Over a year ago

Corrected, need to add ^ and $

Hokyjack Over a year ago

this is very nice. Thank you very much for making your time and helping me! I will prefer cgledezma's pattern because it has oportunity to use \n new line and it is shorter but they are similar, thank you once more. I really apreciate your help!

Xavier S. · Accepted Answer · 2013-07-29 10:01:21Z

0

I hope it could help you:

To select your field:

    ([0-9]+/[0-9]+[,]{0,1})|([0-9]+[,]{0,1})

To replace them:

    st\.\ &1&2

By using sed command line :

    sed -e "s/([0-9]+/[0-9]+[,]{0,1})|([0-9]+[,]{0,1})/st\.\ &1&2/g"

answered Jul 29, 2013 at 10:01

Xavier S.

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1 Comment

Hokyjack Over a year ago

i don't need to have my string replaced and to have "st. " inserted before each number. I only need to have checked the textArea if it matches the regExp

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