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regular expressions with an optional field

chunk1978
224 100+
is it possible to use regular expressions with an optional field within a form?
Jan 19 '07 #1
2 2109
acoder
16,027 Expert Mod 8TB
Yes, check if it's not empty. If it isn't, test with the regular expression, so you only need to test if the field is non-empty, e.g.
Expand|Select|Wrap|Line Numbers
  1. if (document.getElementById(optionalfieldID).value != "") {
  2. //your regular expression matching code
or
Expand|Select|Wrap|Line Numbers
  1. if (document.formname.optionalfield.value != "") {
  2. //your regular expression matching code
Jan 19 '07 #2
chunk1978
224 100+
Yes, check if it's not empty. If it isn't, test with the regular expression, so you only need to test if the field is non-empty
of course! jesus... you have no idea how long i was staring at my screen trying to conceive of this possibility!... i guess it takes a while to get use to... after all, it's logic that's the most difficult part of coding...

thanks again!
Jan 19 '07 #3

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