Regex allow digits and a single dot

Question

What would be the regex to allow digits and a dot  Regarding this  D only allows digits  but it doesn t allow a dot  I need it to allow digits and one dot this is refer as a float value I need to be valid when doing a keyup function in jQuery  but all I need is the regex that only allows what I need it to allow   This will be in the native of JavaScript replace function to remove non-digits and other symbols  except a dot    Cheers

User · Answer

Try this  boxValue   boxValue replace    0-9    g        This Regular Expression will allow only digits and dots in the value of text box

User · Answer

If you want to allow 1 and 1 2      lt       d     d             If you want to allow 1  1 2 and  1      lt       d     d              lt         d           If you want to only allow 1 2  only floats       lt       d    d            d allows digits  while  D allows anything but digits       lt       checks that the number is preceded by either a space or the beginning of the string          makes sure the string is followed by a space or the end of the string  This makes sure the number isn t part of another number or in the middle of words or anything   Edit  added more options  improved the regexes by adding lookahead- and behinds for making sure the numbers are standalone  i e  aren t in the middle of words or other numbers

User · Answer

Try the following expression     d 0 2     d 1 2      test

User · Answer

d    d    Explanation    d  - any number of digits     - a dot   d  - more digits   This will match 123 456   123  123   but not 123  If you want the dot to be optional  in most languages  don t know about jquery  you can use    d     d

User · Answer

My try is combined solution   string   string replace           replace     d    g      replace        x   replace     g      replace  x         string   Math round  parseFloat string    100    100    First line solution from here  regex replacing multiple periods in floating number   It replaces comma     with dot       Replaces first comma with x  Removes all dots and replaces x back to dot   Second line cleans numbers after dot

[regex] Regex allow digits and a single dot

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