Overview slide on html 5 + good explaining on regular expression

html5 slide :


regular expression :


i show exsample from stackoverflow :


^ # Start of string.
[0-9]+ # Must have one or more numbers.
( # Begin optional group.
\. # The decimal point, . must be escaped,
# or it is treated as "any character".
[0-9]{1,2} # One or two numbers.
)? # End group, signify it's optional with ?
$ # End of string.

if i want to use tags in html5 to be supported in older browser check this link ,Mainly fo form


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