Python regex search for decimal digits not followed by character
Using re.search to find one or more decimal digits, an optional K character, not followed by a '%'.
Tried this:
re.search (r'(d+K?)(?!%)', s).group (0)
With the following values for s:
10K 1%
2% 10K
20% 10K
Which returns:
10K
10K
2
The first two results are correct, the last one is not. I want the digit matching to be greedy and skip the "20%" and match the "10K" instead. Found a solution for Java (++), but not Python. Thanks for any tips on this, searched online extensively, but answer has been elusive.
python regex
asked Nov 20 '18 at 3:39
Element GreenElement Green
288
add a comment |
Using re.search to find one or more decimal digits, an optional K character, not followed by a '%'.
Tried this:
re.search (r'(d+K?)(?!%)', s).group (0)
With the following values for s:
10K 1%
2% 10K
20% 10K
Which returns:
10K
10K
2
The first two results are correct, the last one is not. I want the digit matching to be greedy and skip the "20%" and match the "10K" instead. Found a solution for Java (++), but not Python. Thanks for any tips on this, searched online extensively, but answer has been elusive.
python regex
asked Nov 20 '18 at 3:39
Element GreenElement Green
288
Are word boundaries significant?b(d+K?)(?!%)bmay help.
– ggorlen
Nov 20 '18 at 3:52
@ggorlen no, they aren't unfortunately. It could be a standalone value like 10K or just a number like 100. I'm trying to parse a resistor value from schematics which could be just a resistance value, but could also have a percent tolerance, in either order and possibly with no space in between.
– Element Green
Nov 20 '18 at 4:43
add a comment |
Using re.search to find one or more decimal digits, an optional K character, not followed by a '%'.
Tried this:
re.search (r'(d+K?)(?!%)', s).group (0)
With the following values for s:
10K 1%
2% 10K
20% 10K
Which returns:
10K
10K
2
The first two results are correct, the last one is not. I want the digit matching to be greedy and skip the "20%" and match the "10K" instead. Found a solution for Java (++), but not Python. Thanks for any tips on this, searched online extensively, but answer has been elusive.
python regex
asked Nov 20 '18 at 3:39
Element GreenElement Green
288
Using re.search to find one or more decimal digits, an optional K character, not followed by a '%'.
Tried this:
re.search (r'(d+K?)(?!%)', s).group (0)
With the following values for s:
10K 1%
2% 10K
20% 10K
Which returns:
10K
10K
2
The first two results are correct, the last one is not. I want the digit matching to be greedy and skip the "20%" and match the "10K" instead. Found a solution for Java (++), but not Python. Thanks for any tips on this, searched online extensively, but answer has been elusive.
python regex
python regex
asked Nov 20 '18 at 3:39
Element GreenElement Green
288
asked Nov 20 '18 at 3:39
Element GreenElement Green
288
asked Nov 20 '18 at 3:39
Element GreenElement Green
288
asked Nov 20 '18 at 3:39
Element GreenElement Green
288
asked Nov 20 '18 at 3:39
Element GreenElement Green
288
288
Are word boundaries significant?b(d+K?)(?!%)bmay help.
– ggorlen
Nov 20 '18 at 3:52
@ggorlen no, they aren't unfortunately. It could be a standalone value like 10K or just a number like 100. I'm trying to parse a resistor value from schematics which could be just a resistance value, but could also have a percent tolerance, in either order and possibly with no space in between.
– Element Green
Nov 20 '18 at 4:43
add a comment |
Are word boundaries significant?b(d+K?)(?!%)bmay help.
– ggorlen
Nov 20 '18 at 3:52
@ggorlen no, they aren't unfortunately. It could be a standalone value like 10K or just a number like 100. I'm trying to parse a resistor value from schematics which could be just a resistance value, but could also have a percent tolerance, in either order and possibly with no space in between.
– Element Green
Nov 20 '18 at 4:43
Are word boundaries significant?
b(d+K?)(?!%)b may help.– ggorlen
Nov 20 '18 at 3:52
Are word boundaries significant?
b(d+K?)(?!%)b may help.– ggorlen
Nov 20 '18 at 3:52
@ggorlen no, they aren't unfortunately. It could be a standalone value like 10K or just a number like 100. I'm trying to parse a resistor value from schematics which could be just a resistance value, but could also have a percent tolerance, in either order and possibly with no space in between.
– Element Green
Nov 20 '18 at 4:43
@ggorlen no, they aren't unfortunately. It could be a standalone value like 10K or just a number like 100. I'm trying to parse a resistor value from schematics which could be just a resistance value, but could also have a percent tolerance, in either order and possibly with no space in between.
– Element Green
Nov 20 '18 at 4:43
add a comment |
2 Answers
2
active
oldest
votes
Try regex d+K?(?= |$)
This will check a space or an End of the line after K.
Regex
answered Nov 20 '18 at 4:44
RAN_0915RAN_0915
861216
1
Looks like this one works fairly well for my purposes. I didn't think to use a positive look ahead instead of a negative. Thank you!
– Element Green
Nov 20 '18 at 5:03
add a comment |
? mean match 0 or 1 time, replace pattern to (d+K)(?!%)
answered Nov 20 '18 at 3:48
lucas_lyfulucas_lyfu
1
'K' is optional though. Guess I should have made that clear in the examples.
– Element Green
Nov 20 '18 at 4:03
add a comment |
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2 Answers
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active
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2 Answers
2
active
oldest
votes
active
oldest
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active
oldest
votes
Try regex d+K?(?= |$)
This will check a space or an End of the line after K.
Regex
answered Nov 20 '18 at 4:44
RAN_0915RAN_0915
861216
1
Looks like this one works fairly well for my purposes. I didn't think to use a positive look ahead instead of a negative. Thank you!
– Element Green
Nov 20 '18 at 5:03
add a comment |
Try regex d+K?(?= |$)
This will check a space or an End of the line after K.
Regex
answered Nov 20 '18 at 4:44
RAN_0915RAN_0915
861216
1
Looks like this one works fairly well for my purposes. I didn't think to use a positive look ahead instead of a negative. Thank you!
– Element Green
Nov 20 '18 at 5:03
add a comment |
Try regex d+K?(?= |$)
This will check a space or an End of the line after K.
Regex
answered Nov 20 '18 at 4:44
RAN_0915RAN_0915
861216
Try regex d+K?(?= |$)
This will check a space or an End of the line after K.
Regex
answered Nov 20 '18 at 4:44
RAN_0915RAN_0915
861216
answered Nov 20 '18 at 4:44
RAN_0915RAN_0915
861216
answered Nov 20 '18 at 4:44
RAN_0915RAN_0915
861216
answered Nov 20 '18 at 4:44
RAN_0915RAN_0915
861216
861216
1
Looks like this one works fairly well for my purposes. I didn't think to use a positive look ahead instead of a negative. Thank you!
– Element Green
Nov 20 '18 at 5:03
add a comment |
1
Looks like this one works fairly well for my purposes. I didn't think to use a positive look ahead instead of a negative. Thank you!
– Element Green
Nov 20 '18 at 5:03
1
1
Looks like this one works fairly well for my purposes. I didn't think to use a positive look ahead instead of a negative. Thank you!
– Element Green
Nov 20 '18 at 5:03
Looks like this one works fairly well for my purposes. I didn't think to use a positive look ahead instead of a negative. Thank you!
– Element Green
Nov 20 '18 at 5:03
add a comment |
? mean match 0 or 1 time, replace pattern to (d+K)(?!%)
answered Nov 20 '18 at 3:48
lucas_lyfulucas_lyfu
1
'K' is optional though. Guess I should have made that clear in the examples.
– Element Green
Nov 20 '18 at 4:03
add a comment |
? mean match 0 or 1 time, replace pattern to (d+K)(?!%)
answered Nov 20 '18 at 3:48
lucas_lyfulucas_lyfu
1
'K' is optional though. Guess I should have made that clear in the examples.
– Element Green
Nov 20 '18 at 4:03
add a comment |
? mean match 0 or 1 time, replace pattern to (d+K)(?!%)
answered Nov 20 '18 at 3:48
lucas_lyfulucas_lyfu
1
? mean match 0 or 1 time, replace pattern to (d+K)(?!%)
answered Nov 20 '18 at 3:48
lucas_lyfulucas_lyfu
1
answered Nov 20 '18 at 3:48
lucas_lyfulucas_lyfu
1
answered Nov 20 '18 at 3:48
lucas_lyfulucas_lyfu
1
answered Nov 20 '18 at 3:48
lucas_lyfulucas_lyfu
1
1
'K' is optional though. Guess I should have made that clear in the examples.
– Element Green
Nov 20 '18 at 4:03
add a comment |
'K' is optional though. Guess I should have made that clear in the examples.
– Element Green
Nov 20 '18 at 4:03
'K' is optional though. Guess I should have made that clear in the examples.
– Element Green
Nov 20 '18 at 4:03
'K' is optional though. Guess I should have made that clear in the examples.
– Element Green
Nov 20 '18 at 4:03
add a comment |
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Are word boundaries significant?
b(d+K?)(?!%)bmay help.– ggorlen
Nov 20 '18 at 3:52
@ggorlen no, they aren't unfortunately. It could be a standalone value like 10K or just a number like 100. I'm trying to parse a resistor value from schematics which could be just a resistance value, but could also have a percent tolerance, in either order and possibly with no space in between.
– Element Green
Nov 20 '18 at 4:43