Eric Chatonet wrote:
Hi Graham,
I think that there should be also a solution using matchText :-)
Le 25 janv. 06 à 16:25, graham samuel a écrit :
What's the most economical way of checking that a string contains
only certain characters? I'm just trying to check if a string
contains letters, digits and underscores, and nothing else. The ways
I've thought of doing it seem clunky. Basically I want to script
or try...
function isvalid mystring
return not (matchtext(mystring,"[^a-zA-Z0-9_]+?"))
end isvalid
# there is a match if any character other than a-z A-Z 0-9 or _ is found
# in mystring
# using not inverts the result so that the function returns true
# if the string is valid.
Martin Baxter
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