Check if string matches pattern
PythonRegexString MatchingPython Problem Overview
How do I check if a string matches this pattern?
Uppercase letter, number(s), uppercase letter, number(s)...
Example, These would match:
A1B2
B10L1
C1N200J1
These wouldn't ('^' points to problem)
a1B2
^
A10B
^
AB400
^
Python Solutions
Solution 1 - Python
import re
pattern = re.compile("^([A-Z][0-9]+)+$")
pattern.match(string)
Solution 2 - Python
One-liner: re.match(r"pattern", string) # No need to compile
import re
>>> if re.match(r"hello[0-9]+", 'hello1'):
... print('Yes')
...
Yes
You can evalute it as bool
if needed
>>> bool(re.match(r"hello[0-9]+", 'hello1'))
True
Solution 3 - Python
Please try the following:
import re
name = ["A1B1", "djdd", "B2C4", "C2H2", "jdoi","1A4V"]
# Match names.
for element in name:
m = re.match("(^[A-Z]\d[A-Z]\d)", element)
if m:
print(m.groups())
Solution 4 - Python
import re
import sys
prog = re.compile('([A-Z]\d+)+')
while True:
line = sys.stdin.readline()
if not line: break
if prog.match(line):
print 'matched'
else:
print 'not matched'
Solution 5 - Python
import re
ab = re.compile("^([A-Z]{1}[0-9]{1})+$")
ab.match(string)
ab = re.compile("^([A-Z]{1}[0-9]{1})+$")
ab.match(string)
I believe that should work for an uppercase, number pattern.
Solution 6 - Python
regular expressions make this easy ...
[A-Z]
will match exactly one character between A and Z
\d+
will match one or more digits
()
group things (and also return things... but for now just think of them grouping)
+
selects 1 or more
Solution 7 - Python
As stated in the comments, all these answers using re.match
implicitly matches on the start of the string. re.search
is needed if you want to generalize to the whole string.
import re
pattern = re.compile("([A-Z][0-9]+)+")
# finds match anywhere in string
bool(re.search(pattern, 'aA1A1')) # True
# matches on start of string, even though pattern does not have ^ constraint
bool(re.match(pattern, 'aA1A1')) # False
Credit: @LondonRob and @conradkleinespel in the comments.