[Python] python regex error: NameError: name 're' is not defined

I have some code that reads an infofile and extracts information using python's regex and writes it into a new file. When I test this portion of the code individually in its own script, it works perfectly. However when I add it to the rest of my code, I get this error:

NameError: name 're' is not defined


Below is my entire code. The regex portion is obvious (all the re.search commands):

import glob
import subprocess
import os
import datetime
import matplotlib.pyplot as plt
import csv
import re
import ntpath

x = open('data.txt', 'w')
m = open('graphing_data.txt', 'w')

ckopuspath= '/Volumes/DAVIS/sfit-ckopus/ckopus'
command_init = 'sfit4Layer0.py -bv5 -fh'

subprocess.call(command_init.split(), shell=False)


with open('/Volumes/DAVIS/calpy_em27_neu/spectra_out_demo/info.txt', 'rt') as infofile: # the info.txt file created by CALPY
for count, line in enumerate(infofile):
with open('\\_spec_final.t15', 'w') as t:
lat = re.search('Latitude of location:\s*([^;]+)', line, re.IGNORECASE).group(0)
lat = lat.split()
lat = lat[3]
lat = float(lat)

lon = re.search('Longitude of location:\s*([^;]+)', line, re.IGNORECASE).group(0)
lon = lon.split()
lon = lon[3]
lon = float(lon)

date = re.search('Time of measurement \(UTC\): ([^;]+)', line).group(0)
date = date.split()

yeardate = date[4]
yeardate = yeardate.split('-')
year = int(yeardate[0])
month = int(yeardate[1])
day = int(yeardate[2])

time = date[5]
time = time.split(':')
hour = int(time[0])
minute = int(time[1])
second = float(time[2])

dur = re.search('Duration of measurement \[s\]: ([^;]+)', line).group(0)
dur = dur.split()
dur = float(dur[4])

numpoints = re.search('Number of values of one scan:\s*([^;]+)', line, re.IGNORECASE).group(0)
numpoints = numpoints.split()
numpoints = float(numpoints[6])

fov = re.search('semi FOV \[rad\] :\s*([^;]+)', line, re.IGNORECASE).group(0)
fov = fov.split()
fov = fov[3]
fov = float(fov[1:])

sza = re.search('sun Azimuth \[deg\]:\s*([^;]+)', line, re.IGNORECASE).group(0)
sza = sza.split()
sza = float(sza[3])

snr = 0.0000
roe = 6396.2
res = 0.5000

lowwav = re.search('first wavenumber:\s*([^;]+)', line, re.IGNORECASE).group(0)
lowwav = lowwav.split()
lowwav = float(lowwav[2])

highwav = re.search('last wavenumber:\s*([^;]+)', line, re.IGNORECASE).group(0)
highwav = highwav.split()
highwav = float(highwav[2])

spacebw = (highwav - lowwav)/ numpoints


d = datetime.datetime(year, month, day, hour, minute, second)
t.write('{:>12.5f}{:>12.5f}{:>12.5f}{:>12.5f}{:>8.1f}'.format(sza,roe,lat,lon,snr)) # line 1
t.write("\n")
t.write('{:>10d}{:>5d}{:>5d}{:>5d}{:>5d}{:>5d}'.format(year,month,day,hour,minute,second)) # line 2
t.write("\n")
t.write( ('{:%Y/%m/%d %H:%M:%S}'.format(d)) + "UT Solar Azimuth:" + ('{:>6.3f}'.format(sza)) + " Resolution:" + ('{:>6.4f}'.format(res)) + " Duration:" + ('{:>6.2f}'.format(dur))) # line 3
t.write("\n")
t.write('{:>21.13f}{:>26.13f}{:>24.17e}{:>12f}'.format(lowwav,highwav,spacebw,numpoints)) # line 4
t.write("\n")

calpy_path = '/Volumes/DAVIS/calpy_em27_neu/spectra_out_demo/140803/*' # the CALPY output files!
files1 = glob.glob(calpy_path)
with open(files1[count], 'r') as g:
for line in g:
wave_no, intensity = [float(item) for item in line.split()]
if lowwav <= wave_no <= highwav:
t.write(str(intensity) + '\n')

##########################

subprocess.call(['sfit4Layer0.py', '-bv5', '-fs'],shell=False) #I think this writes the summary file

# this retrieves info from summary and outputs it into data.txt (for readability)
# and graphing_data.txt (for graphing)
road = '/Volumes/DAVIS/calpy_em27_neu/spectra_out_demo/sfit4_trial' # path to summary file that is produced - not sure where this is usually*
for infile in glob.glob(os.path.join(road, 'summary*')):
lines = open(infile, 'r').readlines()
#extract info from summary
x.write('{0} {1} {2} {3} {4}'.format(fitrms, chi2, dofsall, dofstrg, iter))
x.write('\n')

x.close()
m.close()

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