javascript - Regex to find a single dot in a string -

javascript - Regex to find a single dot in a string -

is there way find single standing dot in string regex? example, user input is:

7. + 6.5

is there way observe there's unnecessary dot in string 7 , remove while not touching dot in 6.5?

also, there way observe multiple occurrences of same operator next considered invalid:

7 ++++ 5 --- 6

any hint appreciated.

thanks.

to observe multiple occurence of operator regex can be

([^\d\s])\1+

repalce string $1

see link http://regex101.com/r/ln3wh5/1

var re = /([^\d\s])\1+/gm; var str = '7 ++++ 5 --- 6 + 5'; var subst = '$1'; var result = str.replace(re, subst);

will produce output as

7 + 5 - 5 +5

the single standing . can matched using negative positive lookahead (?! )

using regex

\.(?!\d)

the matched part can see @ http://regex101.com/r/tc7ro6/1

edit

to validate string contain single operator,

regex : ^\d+(\s*[+-\/*%]\s*\d+)+$

test : http://regex101.com/r/ln3wh5/3

javascript regex