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A small gist that toys with trimming a string
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| import re | |
| def regexTrim(theString): | |
| # Neat little trim function that uses expressions and replace/substring | |
| resultString = re.sub("^\s+", "", theString) # Trim Start | |
| resultString = re.sub("\s+$", "", resultString) # Trim End | |
| return resultString | |
| def trim(theString): | |
| # Algorithm that does what it's supposed to | |
| sliceStart = 0; | |
| sliceEnd = len(theString); | |
| # Front to back, break on non space char | |
| cntIndex = 0 | |
| while cntIndex < len(theString): | |
| if theString[cntIndex] != ' ': | |
| sliceStart = cntIndex | |
| break | |
| else: | |
| cntIndex += 1 | |
| # Back to front, break on non space char | |
| cntIndex = len(theString) - 1 | |
| while cntIndex >= 0: | |
| if theString[cntIndex] != ' ': | |
| sliceEnd = cntIndex + 1 | |
| break | |
| else: | |
| cntIndex -= 1 | |
| return theString[sliceStart: sliceEnd] | |
| tests = { | |
| # String: Expected | |
| " foo": "foo", | |
| " bar ": "bar", | |
| "baz ": "baz", | |
| " ba zza ": "ba zza", | |
| "blah": "blah", | |
| "": "" | |
| } | |
| print("-----Array Operations Tests ------") | |
| for key in tests: | |
| trimmed = trim(key) | |
| if trimmed == tests[key]: | |
| result = "PASS" | |
| else: | |
| result = "FAIL - expected {}".format(tests[key]) | |
| print("TEST: '{}': '{}' {}".format(key, trim(key), result)) | |
| print("-----Regex Tests------") | |
| for key in tests: | |
| trimmed = trim(key) | |
| if trimmed == tests[key]: | |
| result = "PASS" | |
| else: | |
| result = "FAIL - expected {}".format(tests[key]) | |
| print("TEST: '{}': '{}' {}".format(key, regexTrim(key), result)) | |
| # Notes: | |
| # ^(\s*)[^\s-]*(\s*)$ This doesn't work, it doesn't match the space in the middle of the word. | |
| # Neither does ^\s*(.+)\s*$ because the (.+) in the middle also matches that space at the end. | |
| # Output: | |
| #-----Array Operations Tests ------ | |
| #TEST: '': '' PASS | |
| #TEST: 'baz ': 'baz' PASS | |
| #TEST: 'blah': 'blah' PASS | |
| #TEST: ' ba zza ': 'ba zza' PASS | |
| #TEST: ' bar ': 'bar' PASS | |
| #TEST: ' foo': 'foo' PASS | |
| #-----Regex Tests------ | |
| #TEST: '': '' PASS | |
| #TEST: 'baz ': 'baz' PASS | |
| #TEST: 'blah': 'blah' PASS | |
| #TEST: ' ba zza ': 'ba zza' PASS | |
| #TEST: ' bar ': 'bar' PASS | |
| #TEST: ' foo': 'foo' PASS |
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