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Quantifier Regular Expressions


Quantifiers specify how many instances of the previous element (which can be a character, a group, or a character class) must be present in the input string for a match to occur.

QuantifierDescriptionPatternMatches
*Matches the previous element zero or more times.\d*\.\d".0", "19.9", "219.9"
+Matches the previous element one or more times."be+""bee" in "been", "be" in "bent"
?Matches the previous element zero or one time."rai?n""ran", "rain"
{ n }Matches the previous element exactly n times.",\d{3}"",043" in "1,043.6", ",876", ",543", and ",210" in "9,876,543,210"
{ n ,}Matches the previous element at least n times."\d{2,}""166", "29", "1930"
{ n , m }Matches the previous element at least n times, but no more than m times."\d{3,5}""166", "17668" "19302" in "193024"
*?Matches the previous element zero or more times, but as few times as possible.\d*?\.\d".0", "19.9", "219.9"
+?Matches the previous element one or more times, but as few times as possible."be+?""be" in "been", "be" in "bent"
??Matches the previous element zero or one time, but as few times as possible."rai??n""ran", "rain"
{ n }?Matches the preceding element exactly n times.",\d{3}?"",043" in "1,043.6", ",876", ",543", and ",210" in "9,876,543,210"
{ n ,}?Matches the previous element at least n times, but as few times as possible."\d{2,}?""166", "29", "1930"
{ n , m }?Matches the previous element between n and m times, but as few times as possible."\d{3,5}?""166", "17668" "193", "024" in "193024"


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