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Change pattern search mechanism #1011

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Change pattern search mechanism #1011

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31 changes: 16 additions & 15 deletions strings/naive_string_search.py
100644 → 100755
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Original file line number Diff line number Diff line change
Expand Up @@ -7,23 +7,24 @@
n=length of main string
m=length of pattern string
"""
def naivePatternSearch(mainString,pattern):
patLen=len(pattern)
strLen=len(mainString)
position=[]
for i in range(strLen-patLen+1):
match_found=True
for j in range(patLen):
if mainString[i+j]!=pattern[j]:
match_found=False
break
if match_found:


def naivePatternSearch(mainString, pattern):
patLen = len(pattern)
strLen = len(mainString)
position = []
if patLen > strLen:
return position
for i in range(strLen - patLen + 1):
if mainString[i : i + patLen + 1] == pattern:
position.append(i)
return position

mainString="ABAAABCDBBABCDDEBCABC"
pattern="ABC"
position=naivePatternSearch(mainString,pattern)

mainString = "ABAAABCDBBABCDDEBCABC"
pattern = "ABC"
position = naivePatternSearch(mainString, pattern)
print("Pattern found in position ")
for x in position:
print(x)
print(x)