Regular expression designed to admit only a maximum of two underscore characters, as well as no other special characters, with the condition that the character prior or

Looking for a specific format within a string, such as SOM_P9ERR96M27VP4_PL. The conditions are: must have exactly two underscores, not at the beginning or end of the string, and no other special characters like "&*$," following the underscore. Additionally, a character must follow the underscore and consecutive underscores (__) are not allowed. Using this regular expression 

/^(?![_])^[^_]*(_[^_]*){2}[^_](|_[a-zA-Z0-9])$/
fulfills most requirements, except the restriction on consecutive underscores, such as SOM__P9QTR96M27VP4PL.

javascriptregex

Answer №1

To enhance the pattern, you may adjust it to identify 2 instances of the character class [a-zA-Z0-9]+ connected by an underscore, and then another instance of the character class [a-zA-Z0-9]+ at the end.

This modification ensures that there are exactly 2 underscores in total, not at the beginning or end, and not consecutively repeated.

^[a-zA-Z0-9]+_[a-zA-Z0-9]+_[a-zA-Z0-9]+$

See the Regex demo here

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