c# - Find out $ amount by using regular expressions -

can tell me how find out $ amount of below kind of string using regular expressions ? i'm not @ regex :( in advance.

jone has done $15 per unit: "good luck" 

result should = $15

you can use simple regex like

\$\d+ 

• \$ matches $
• \d+ matches 1 or more digits

regex demo

example

string str = "jone has done $15 per unit: \"good luck\""; regex pattern = new regex (@"\$\d+"); match match = pattern.match(str); console.writeline(match.groups[0]); => $15 

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edit

to include decimals well

\$\d+(?:\.\d+)? 

• \. matches decimal point
• \d+ matches 1 or more digits
• ? quantifier, matches 0 or 1 presceding pattern. quantifier ensure optional matching of decimal part.

regex demo

example

string str = "jone has done $15.5 per unit: \"good luck\""; regex pattern = new regex (@"\$\d+(?:\.\d+)?"); match match = pattern.match(str); console.writeline(match.groups[0]); => $15.5