Assume that a poem is given. Write the regular expressions for the following:
If the pattern has characters 'ai' or 'hi', replace the next three characters with *\*.
poem ='''
If I can stop one heart from breaking,
I shall not live in vain;
If I can ease one life the aching,
Or cool one pain,
Or help one fainting robin
Unto his nest again,
I shall not live in vain.'''
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Python tags, and clearly explain the problem you are having, including the full text of any errors.
See, I was trying this code:
c = poem
a = c.split(" ")
for i in range(0,len(a)):
laura = 0
for j in range(0,len(a[i])):
if len(a[i])>6:
laura = 0
elif a[i][j] == "\n":
laura = 1
if len(a[i])>=6 and laura == 0:
list_=list(a[i])
for j in range(0,len(list_)):
if list_[j] =="a" and list_[j+1] =="i":
list_[j+2] = "*"
list_[j+3] = "\\"
list_[j+4] = "*"
temp=""
for j in list_:
temp+=j
a[i] = temp
list__=list(a[i])
for j in range(0,len(list__)):
if list__[j] =="h" and list__[j+1] =="i":
list__[j+2] = "*"
list__[j+3] = "\\"
list__[j+4] = "*"
temp1=""
for j in list__:
temp1+=j
a[i] = temp1
b =""
for i in range(0,len(a)):
b+=a[i] +" "
print(b)I am getting this Output:
Output:
If I can stop one heart from breaking,
I shall not live in vai*\*If I can ease one life the achi*\*
Or cool one pai*\*Or help one fai*\*ng robin
Unto his nest agai*\*I shall not live in vain.
But the real output is
Output:
If I can stop one heart from breaking,
I shall not live in vain;
If I can ease one life the achi*\*
Or cool one pain,
Or help one fai*\*ng robin
Unto hi*\*est again,
I shall not live in vain.
Your assignment says to use a regular expression, and you have failed to do that. You should read up on the
re module, it will make the task so much simpler.
Without regex (kiss):
poem.replace('ai', '*/*').replace('hi', '*/*')A regex, which will detect ai and hi:
r'ai|hi'
You can use
re.sub for replacement.
To construct or check a regex, you should visit this site:
https://regex101.com/