Python regex `search` function
Python Regex search() function explained with examples.
The Search Function
The search
function searches for first occurance of a re
pattern to string with optional flags.
Here is the syntax for this function −
re.search(pattern, string, flags=0)
Where,
pattern
is the regular expression to be matched,
string
is the string to be searched to match the pattern at the beginning of string and
flags
, which you can specify different flags using bitwise OR (|
).
Match Flags
Modifier | Description |
---|---|
re.I |
Performs case-insensitive matching. |
re.L |
Interprets words according to the current locale. This interpretation affects the alphabetic group (\w and \W ), as well as word boundary behavior (\b and \B ). |
re.M |
Makes $ match the end of a line and makes ^ match the start of any line. |
re.S |
Makes a period (dot) match any character, including a newline. |
re.U |
Interprets letters according to the Unicode character set. This flag affects the behavior of \w , \W , \b , \B . |
re.X |
It ignores whitespace (except inside a set [] or when escaped by a backslash and treats unescaped # as a comment marker. |
Return values
- The
re.search
function returns a matchobject
on success andNone
upon failure. - - Use
group(n)
orgroups()
function of match object to get matched expression, e.g.,group(n=0)
returns entire match (or specific subgroupn
) - The function
groups()
returns all matching subgroups in a tuple (empty if there weren’t any).
Example 1
Let’s find the words before and after the word to
:
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