Test whether a string contains a substring matching the pattern:

Give a list of strings as input:

Use the operator form of StringContainsQ:

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:

StringContainsQ automatically threads over lists of strings:

Check whether a biomolecular sequence contains 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:

Circular sequences support wraparound checks:

Pick all the lines that contain a substring that matches the pattern:

Line numbers with corresponding texts that contain "noon" or "day of":

StringContainsQ threads over lists of strings in the first argument:

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

StringFreeQ["string",patt] is equivalent to !StringContainsQ["string",patt]:

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

StringContainsQ checks whether a substring matches a pattern:

StringContainsQ generally returns True when StringMatchQ is True:

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

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

StringEndsQ["string",patt] is equivalent to StringContainsQ["string",patt~~EndOfString]:

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

Use StringCases to extract substrings matching a given pattern: