Check that a string starts with a given prefix:

Give a list of strings as input:

Specify a prefix using a string pattern:

Use the operator form of StringStartsQ:

Use the operator form to select strings:

Use string patterns:

Use a regular expression:

Mix regular expressions and string patterns:

Use pattern matching for dates:

Test for occurrences of either pattern:

StringStartsQ automatically threads over lists of strings:

Check whether a biomolecular sequence starts with a particular substring:

Use a wildcard in the pattern compared against a biomolecular sequence:

The "N" is a degenerate letter only in biomolecular sequences:

Check for literal degenerate letters using Verbatim:

StringStartsQ threads over lists of strings in the first argument:

StringStartsQ["string",{patt₁,patt₂,…}] is equivalent to StringStartsQ["string",Alternatives[patt₁,patt₂,…]]:

StringEndsQ checks whether a suffix matches a pattern:

StringStartsQ checks whether a prefix matches a pattern:

Use StringMatchQ to check whether a whole string matches a pattern:

StringStartsQ checks whether a prefix matches a pattern:

StringStartsQ returns True whenever StringMatchQ is True:

StringStartsQ["string",patt] is equivalent to StringMatchQ["string",StartOfString~~patt~~___]:

StringStartsQ["string",patt] is equivalent to StringContainsQ["string",StartOfString~~patt]:

Get the starting and ending positions where a prefix occurs by using StringPosition:

Use StringCases to extract prefixes matching a given pattern: