regex - Regular Expression With String Contain Digit With WildCard/Min,MaxLength In Javascript -

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i new javascript regular expressions. trying create regex on string may contain digit.

scenario following:<

the string may contain * either before or after or both not in middle.

the string length minimum of 2 characters , maximum of 12 characters (not counting *).

input string example:

ab1542378522 ac6546457869 oa6546457869

other valid strings are:

*154* *c6* ab* ab154237* *2378522 *c654645 *645 *ab* *ac6546457869* oa*

invalid strings:

*15*4 *15*4* *a*b15*42*37*

only * wildcard supported, no other special character allowed in input. example in above input string ab, ac , oa valid first 2 character not aa, ax, os... follow 10 digits @ max.

i unable create such regex covers above use-cases. code getting exhausted if else branching. if find answer post in comment. make comment confusion.

try use pattern:

/^\*?(?=[^*]{2})[a-z]{0,2}[0-9]{0,10}\*?$/

pattern explanation:

^           begining of string \*?         optional *  (?=[^*]{2}) check if @ least 2 characters not * follows [a-z]{0,2}  between 0 , 2 letters [0-9]{0,10} between 0 , 10 digits \*?         optional * $           end of string

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