python - how to write regex for a price expression? -


expression : "price(might contain comma) eg"

examples:

40 eg

or 

4,657 eg

or

4,352,345 eg

i want 1 string regex should use of these cases.

you try one:

^\d{1,3}(,\d{3})*\seg$

if want decimals well...

^\d{1,3}(,\d{3})*(\.\d\d?)?\seg$

now, if can have numbers (more 999) without commas @ , possible decimal...

^\d{1,3}(,?\d{3})*(\.\d\d?)?\seg$

more details:

^ @ start means price must start next character (here \d meaning numeric character)

\d{1,3} means 1 3 numeric characters.

(,\d{3})* group, appearing 0 times or more, consisting of comma , 3 numeric characters. assuming price 'clean', things ,34 in price 3,34 eg won't allowed through.

(\.\d\d?)? group, appearing 0 or 1 time, consisting of period ., digit , second possible digit. things .2 or .54 allowed. .564 not, however.

\s means 1 space character, , no more, no less. if price data given 'clean', there should no issue , identify not 'clean'.

eg matches currency eg.

$ means preceding character (g in case) has last one.


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