How to replace numbers in a string?

up vote
5
down vote

favorite

I have a long string list:

string = "E:\job\a\000251.png", "E:\job\a\000252.png",
 "E:\job\a\000253.png", "E:\job\a\000254.png",
 "E:\job\a\000255.png", "E:\job\a\000256.png"

Now, I want to add 2 to the file name base when the file base name is an even number. I mean, I hope to get such new string list:

string = "E:\job\a\000251.png", "E:\job\a\000254.png",
 "E:\job\a\000253.png", "E:\job\a\000256.png",
 "E:\job\a\000255.png", "E:\job\a\000258.png"

How to implement it?

edited 6 mins ago

Johu

2,776929

asked 6 hours ago

yode

9,79823097

add a commentÂ |Â

up vote
5
down vote

favorite

I have a long string list:

string = "E:\job\a\000251.png", "E:\job\a\000252.png",
 "E:\job\a\000253.png", "E:\job\a\000254.png",
 "E:\job\a\000255.png", "E:\job\a\000256.png"

Now, I want to add 2 to the file name base when the file base name is an even number. I mean, I hope to get such new string list:

string = "E:\job\a\000251.png", "E:\job\a\000254.png",
 "E:\job\a\000253.png", "E:\job\a\000256.png",
 "E:\job\a\000255.png", "E:\job\a\000258.png"

How to implement it?

edited 6 mins ago

Johu

2,776929

asked 6 hours ago

yode

9,79823097

add a commentÂ |Â

up vote
5
down vote

favorite

I have a long string list:

string = "E:\job\a\000251.png", "E:\job\a\000252.png",
 "E:\job\a\000253.png", "E:\job\a\000254.png",
 "E:\job\a\000255.png", "E:\job\a\000256.png"

Now, I want to add 2 to the file name base when the file base name is an even number. I mean, I hope to get such new string list:

string = "E:\job\a\000251.png", "E:\job\a\000254.png",
 "E:\job\a\000253.png", "E:\job\a\000256.png",
 "E:\job\a\000255.png", "E:\job\a\000258.png"

How to implement it?

edited 6 mins ago

Johu

2,776929

asked 6 hours ago

yode

9,79823097

I have a long string list:

string = "E:\job\a\000251.png", "E:\job\a\000252.png",
 "E:\job\a\000253.png", "E:\job\a\000254.png",
 "E:\job\a\000255.png", "E:\job\a\000256.png"

Now, I want to add 2 to the file name base when the file base name is an even number. I mean, I hope to get such new string list:

string = "E:\job\a\000251.png", "E:\job\a\000254.png",
 "E:\job\a\000253.png", "E:\job\a\000256.png",
 "E:\job\a\000255.png", "E:\job\a\000258.png"

How to implement it?

string-manipulation stringreplace

edited 6 mins ago

Johu

2,776929

asked 6 hours ago

yode

9,79823097

edited 6 mins ago

Johu

2,776929

asked 6 hours ago

yode

9,79823097

edited 6 mins ago

Johu

2,776929

edited 6 mins ago

Johu

2,776929

edited 6 mins ago

Johu

2,776929

asked 6 hours ago

yode

9,79823097

asked 6 hours ago

yode

9,79823097

asked 6 hours ago

yode

9,79823097

add a commentÂ |Â

3 Answers
3

active

oldest

votes

up vote
3
down vote

You could create a helper function (the point of the helper function is to avoid calling FromDigits twice):

incString[s_] := With[r = FromDigits[s],
 If[EvenQ[r],
 IntegerString[r+2, 10, StringLength[s]],
 s
 ]
]

and then use this helper function in StringReplace:

StringReplace[
 string,
 i:DigitCharacter..~~".png" :> incString[i]<>".png"
]

"E:joba00251.png", "E:joba00254.png",
"E:joba00253.png", "E:joba00256.png", "E:joba00255.png",
"E:joba00258.png"

edited 4 hours ago

answered 5 hours ago

Carl Woll

56.8k272147

add a commentÂ |Â

up vote
2
down vote

StringReplace[string, 
 a : NumberString ~~ "." /; EvenQ[FromDigits[a]] :> 
 StringJoin[ToString /@ 
 PadLeft[IntegerDigits[FromDigits[a] + 2], StringLength@a]] ~~ "."]

"E:joba00251.png",

"E:joba00254.png",

"E:joba00253.png",

"E:joba00256.png",

"E:joba00255.png",

"E:joba00258.png"

edited 5 hours ago

answered 5 hours ago

kglr

160k8184384

Maybe more concise StringReplace[string, a : DigitCharacter ~~ "." /; EvenQ[FromDigits[a]] :> StringJoin[ToString[FromDigits[a] + 2]] ~~ "."]
â€“Â yode
5 hours ago

see here please.
â€“Â yode
5 hours ago

@yode, if you don't have elements like "E:joba00258.png" in your string list your more concise version would work too.
â€“Â kglr
5 hours ago

add a commentÂ |Â

up vote
0
down vote

Here is an approach without StringReplace. It is one function f that first destructures the file-name and has two more definitions: one for files with an even number and one for all others.

ClearAll[f]
f[str_String] := f[str, DirectoryName[str], FileBaseName[str], FileExtension[str]];

f[str_, dir_, name_, ext_ /; ToExpression[name, InputForm, EvenQ]] :=
 With[
 num = IntegerString[FromDigits[name] + 2, 10, StringLength[name]]
 , FileNameJoin[dir, num <> "." <> ext]];

f[str_, __] := str

Now better test it properly since my last version was completely screwed up. I need to make Linux filenames from your strings since otherwise, Mathematica's file functions don't work here. On your Windows machine, this should not be necessary.

string = "E:\job\a\000251.png", "E:\job\a\000252.png", 
 "E:\job\a\000253.png", "E:\job\a\000254.png", 
 "E:\job\a\000255.png", "E:\job\a\000256.png";
string = StringReplace[string, "E:\" :> "/", "\" :> "/"]

f/@string//Column
(* 
/job/a/000251.png
/job/a/000254.png
/job/a/000253.png
/job/a/000256.png
/job/a/000255.png
/job/a/000258.png 
*)

edited 2 hours ago

answered 4 hours ago

halirutanâ™¦

92.8k5212405

I have the greatest admiration for your contributions. I am trying to follow your answer but I believe there is an error in the second definition of f. num is defined as a local constant in With but never used in the output. I would also appreciate it if you would show how to use f for the given example.
â€“Â Jack LaVigne
2 hours ago

@JackLaVigne Oh my goodness. There was so much wrong in my code because I didn't clear f for testing. Thank you for paying attention! Would you test if it works on windows with the original definition of strings?
â€“Â halirutanâ™¦
2 hours ago

Works fine in Windows. I was thinking I had to Map the function f`` over string`. Thank you for the update and example. It is clear to me now.
â€“Â Jack LaVigne
2 hours ago

It doesn't work for "/job/a/000258.png" where f returns "/job/a/0002510.png".
â€“Â Carl Woll
2 hours ago

@CarlWoll If you are on Windows, then this seems to be expected. Filename separators are OS specific and Mathematica's functions don't work if you are on Windows and try Unix files.
â€“Â halirutanâ™¦
2 hours ago

Â |Â
show 3 more comments

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

up vote
3
down vote

You could create a helper function (the point of the helper function is to avoid calling FromDigits twice):

incString[s_] := With[r = FromDigits[s],
 If[EvenQ[r],
 IntegerString[r+2, 10, StringLength[s]],
 s
 ]
]

and then use this helper function in StringReplace:

StringReplace[
 string,
 i:DigitCharacter..~~".png" :> incString[i]<>".png"
]

"E:joba00251.png", "E:joba00254.png",
"E:joba00253.png", "E:joba00256.png", "E:joba00255.png",
"E:joba00258.png"

edited 4 hours ago

answered 5 hours ago

Carl Woll

56.8k272147

add a commentÂ |Â

up vote
3
down vote

You could create a helper function (the point of the helper function is to avoid calling FromDigits twice):

incString[s_] := With[r = FromDigits[s],
 If[EvenQ[r],
 IntegerString[r+2, 10, StringLength[s]],
 s
 ]
]

and then use this helper function in StringReplace:

StringReplace[
 string,
 i:DigitCharacter..~~".png" :> incString[i]<>".png"
]

"E:joba00251.png", "E:joba00254.png",
"E:joba00253.png", "E:joba00256.png", "E:joba00255.png",
"E:joba00258.png"

edited 4 hours ago

answered 5 hours ago

Carl Woll

56.8k272147

add a commentÂ |Â

up vote
3
down vote

You could create a helper function (the point of the helper function is to avoid calling FromDigits twice):

incString[s_] := With[r = FromDigits[s],
 If[EvenQ[r],
 IntegerString[r+2, 10, StringLength[s]],
 s
 ]
]

and then use this helper function in StringReplace:

StringReplace[
 string,
 i:DigitCharacter..~~".png" :> incString[i]<>".png"
]

"E:joba00251.png", "E:joba00254.png",
"E:joba00253.png", "E:joba00256.png", "E:joba00255.png",
"E:joba00258.png"

edited 4 hours ago

answered 5 hours ago

Carl Woll

56.8k272147

You could create a helper function (the point of the helper function is to avoid calling FromDigits twice):

incString[s_] := With[r = FromDigits[s],
 If[EvenQ[r],
 IntegerString[r+2, 10, StringLength[s]],
 s
 ]
]

and then use this helper function in StringReplace:

StringReplace[
 string,
 i:DigitCharacter..~~".png" :> incString[i]<>".png"
]

"E:joba00251.png", "E:joba00254.png",
"E:joba00253.png", "E:joba00256.png", "E:joba00255.png",
"E:joba00258.png"

edited 4 hours ago

answered 5 hours ago

Carl Woll

56.8k272147

edited 4 hours ago

answered 5 hours ago

Carl Woll

56.8k272147

answered 5 hours ago

Carl Woll

56.8k272147

answered 5 hours ago

Carl Woll

56.8k272147

add a commentÂ |Â

up vote
2
down vote

StringReplace[string, 
 a : NumberString ~~ "." /; EvenQ[FromDigits[a]] :> 
 StringJoin[ToString /@ 
 PadLeft[IntegerDigits[FromDigits[a] + 2], StringLength@a]] ~~ "."]

"E:joba00251.png",

"E:joba00254.png",

"E:joba00253.png",

"E:joba00256.png",

"E:joba00255.png",

"E:joba00258.png"

edited 5 hours ago

answered 5 hours ago

kglr

160k8184384

Maybe more concise StringReplace[string, a : DigitCharacter ~~ "." /; EvenQ[FromDigits[a]] :> StringJoin[ToString[FromDigits[a] + 2]] ~~ "."]
â€“Â yode
5 hours ago

see here please.
â€“Â yode
5 hours ago

@yode, if you don't have elements like "E:joba00258.png" in your string list your more concise version would work too.
â€“Â kglr
5 hours ago

add a commentÂ |Â

up vote
2
down vote

StringReplace[string, 
 a : NumberString ~~ "." /; EvenQ[FromDigits[a]] :> 
 StringJoin[ToString /@ 
 PadLeft[IntegerDigits[FromDigits[a] + 2], StringLength@a]] ~~ "."]

"E:joba00251.png",

"E:joba00254.png",

"E:joba00253.png",

"E:joba00256.png",

"E:joba00255.png",

"E:joba00258.png"

edited 5 hours ago

answered 5 hours ago

kglr

160k8184384

Maybe more concise StringReplace[string, a : DigitCharacter ~~ "." /; EvenQ[FromDigits[a]] :> StringJoin[ToString[FromDigits[a] + 2]] ~~ "."]
â€“Â yode
5 hours ago

see here please.
â€“Â yode
5 hours ago

@yode, if you don't have elements like "E:joba00258.png" in your string list your more concise version would work too.
â€“Â kglr
5 hours ago

add a commentÂ |Â

up vote
2
down vote

StringReplace[string, 
 a : NumberString ~~ "." /; EvenQ[FromDigits[a]] :> 
 StringJoin[ToString /@ 
 PadLeft[IntegerDigits[FromDigits[a] + 2], StringLength@a]] ~~ "."]

"E:joba00251.png",

"E:joba00254.png",

"E:joba00253.png",

"E:joba00256.png",

"E:joba00255.png",

"E:joba00258.png"

edited 5 hours ago

answered 5 hours ago

kglr

160k8184384

StringReplace[string, 
 a : NumberString ~~ "." /; EvenQ[FromDigits[a]] :> 
 StringJoin[ToString /@ 
 PadLeft[IntegerDigits[FromDigits[a] + 2], StringLength@a]] ~~ "."]

"E:joba00251.png",

"E:joba00254.png",

"E:joba00253.png",

"E:joba00256.png",

"E:joba00255.png",

"E:joba00258.png"

edited 5 hours ago

answered 5 hours ago

kglr

160k8184384

edited 5 hours ago

answered 5 hours ago

kglr

160k8184384

answered 5 hours ago

kglr

160k8184384

answered 5 hours ago

kglr

160k8184384

Maybe more concise StringReplace[string, a : DigitCharacter ~~ "." /; EvenQ[FromDigits[a]] :> StringJoin[ToString[FromDigits[a] + 2]] ~~ "."]
â€“Â yode
5 hours ago

see here please.
â€“Â yode
5 hours ago

@yode, if you don't have elements like "E:joba00258.png" in your string list your more concise version would work too.
â€“Â kglr
5 hours ago

add a commentÂ |Â

Maybe more concise StringReplace[string, a : DigitCharacter ~~ "." /; EvenQ[FromDigits[a]] :> StringJoin[ToString[FromDigits[a] + 2]] ~~ "."]
â€“Â yode
5 hours ago

see here please.
â€“Â yode
5 hours ago

@yode, if you don't have elements like "E:joba00258.png" in your string list your more concise version would work too.
â€“Â kglr
5 hours ago

Maybe more concise

StringReplace[string, a : DigitCharacter ~~ "." /; EvenQ[FromDigits[a]] :> StringJoin[ToString[FromDigits[a] + 2]] ~~ "."]

â€“Â yode
5 hours ago

Maybe more concise

StringReplace[string, a : DigitCharacter ~~ "." /; EvenQ[FromDigits[a]] :> StringJoin[ToString[FromDigits[a] + 2]] ~~ "."]

â€“Â yode
5 hours ago

see here please.
â€“Â yode
5 hours ago

@yode, if you don't have elements like "E:joba00258.png" in your string list your more concise version would work too.
â€“Â kglr
5 hours ago

add a commentÂ |Â

up vote
0
down vote

Here is an approach without StringReplace. It is one function f that first destructures the file-name and has two more definitions: one for files with an even number and one for all others.

ClearAll[f]
f[str_String] := f[str, DirectoryName[str], FileBaseName[str], FileExtension[str]];

f[str_, dir_, name_, ext_ /; ToExpression[name, InputForm, EvenQ]] :=
 With[
 num = IntegerString[FromDigits[name] + 2, 10, StringLength[name]]
 , FileNameJoin[dir, num <> "." <> ext]];

f[str_, __] := str

string = "E:\job\a\000251.png", "E:\job\a\000252.png", 
 "E:\job\a\000253.png", "E:\job\a\000254.png", 
 "E:\job\a\000255.png", "E:\job\a\000256.png";
string = StringReplace[string, "E:\" :> "/", "\" :> "/"]

f/@string//Column
(* 
/job/a/000251.png
/job/a/000254.png
/job/a/000253.png
/job/a/000256.png
/job/a/000255.png
/job/a/000258.png 
*)

edited 2 hours ago

answered 4 hours ago

halirutanâ™¦

92.8k5212405

I have the greatest admiration for your contributions. I am trying to follow your answer but I believe there is an error in the second definition of f. num is defined as a local constant in With but never used in the output. I would also appreciate it if you would show how to use f for the given example.
â€“Â Jack LaVigne
2 hours ago

@JackLaVigne Oh my goodness. There was so much wrong in my code because I didn't clear f for testing. Thank you for paying attention! Would you test if it works on windows with the original definition of strings?
â€“Â halirutanâ™¦
2 hours ago

Works fine in Windows. I was thinking I had to Map the function f`` over string`. Thank you for the update and example. It is clear to me now.
â€“Â Jack LaVigne
2 hours ago

It doesn't work for "/job/a/000258.png" where f returns "/job/a/0002510.png".
â€“Â Carl Woll
2 hours ago

@CarlWoll If you are on Windows, then this seems to be expected. Filename separators are OS specific and Mathematica's functions don't work if you are on Windows and try Unix files.
â€“Â halirutanâ™¦
2 hours ago

Â |Â
show 3 more comments

up vote
0
down vote

Here is an approach without StringReplace. It is one function f that first destructures the file-name and has two more definitions: one for files with an even number and one for all others.

ClearAll[f]
f[str_String] := f[str, DirectoryName[str], FileBaseName[str], FileExtension[str]];

f[str_, dir_, name_, ext_ /; ToExpression[name, InputForm, EvenQ]] :=
 With[
 num = IntegerString[FromDigits[name] + 2, 10, StringLength[name]]
 , FileNameJoin[dir, num <> "." <> ext]];

f[str_, __] := str

string = "E:\job\a\000251.png", "E:\job\a\000252.png", 
 "E:\job\a\000253.png", "E:\job\a\000254.png", 
 "E:\job\a\000255.png", "E:\job\a\000256.png";
string = StringReplace[string, "E:\" :> "/", "\" :> "/"]

f/@string//Column
(* 
/job/a/000251.png
/job/a/000254.png
/job/a/000253.png
/job/a/000256.png
/job/a/000255.png
/job/a/000258.png 
*)

edited 2 hours ago

answered 4 hours ago

halirutanâ™¦

92.8k5212405

I have the greatest admiration for your contributions. I am trying to follow your answer but I believe there is an error in the second definition of f. num is defined as a local constant in With but never used in the output. I would also appreciate it if you would show how to use f for the given example.
â€“Â Jack LaVigne
2 hours ago

@JackLaVigne Oh my goodness. There was so much wrong in my code because I didn't clear f for testing. Thank you for paying attention! Would you test if it works on windows with the original definition of strings?
â€“Â halirutanâ™¦
2 hours ago

Works fine in Windows. I was thinking I had to Map the function f`` over string`. Thank you for the update and example. It is clear to me now.
â€“Â Jack LaVigne
2 hours ago

It doesn't work for "/job/a/000258.png" where f returns "/job/a/0002510.png".
â€“Â Carl Woll
2 hours ago

@CarlWoll If you are on Windows, then this seems to be expected. Filename separators are OS specific and Mathematica's functions don't work if you are on Windows and try Unix files.
â€“Â halirutanâ™¦
2 hours ago

Â |Â
show 3 more comments

up vote
0
down vote

Here is an approach without StringReplace. It is one function f that first destructures the file-name and has two more definitions: one for files with an even number and one for all others.

ClearAll[f]
f[str_String] := f[str, DirectoryName[str], FileBaseName[str], FileExtension[str]];

f[str_, dir_, name_, ext_ /; ToExpression[name, InputForm, EvenQ]] :=
 With[
 num = IntegerString[FromDigits[name] + 2, 10, StringLength[name]]
 , FileNameJoin[dir, num <> "." <> ext]];

f[str_, __] := str

string = "E:\job\a\000251.png", "E:\job\a\000252.png", 
 "E:\job\a\000253.png", "E:\job\a\000254.png", 
 "E:\job\a\000255.png", "E:\job\a\000256.png";
string = StringReplace[string, "E:\" :> "/", "\" :> "/"]

f/@string//Column
(* 
/job/a/000251.png
/job/a/000254.png
/job/a/000253.png
/job/a/000256.png
/job/a/000255.png
/job/a/000258.png 
*)

edited 2 hours ago

answered 4 hours ago

halirutanâ™¦

92.8k5212405

Here is an approach without StringReplace. It is one function f that first destructures the file-name and has two more definitions: one for files with an even number and one for all others.

ClearAll[f]
f[str_String] := f[str, DirectoryName[str], FileBaseName[str], FileExtension[str]];

f[str_, dir_, name_, ext_ /; ToExpression[name, InputForm, EvenQ]] :=
 With[
 num = IntegerString[FromDigits[name] + 2, 10, StringLength[name]]
 , FileNameJoin[dir, num <> "." <> ext]];

f[str_, __] := str

string = "E:\job\a\000251.png", "E:\job\a\000252.png", 
 "E:\job\a\000253.png", "E:\job\a\000254.png", 
 "E:\job\a\000255.png", "E:\job\a\000256.png";
string = StringReplace[string, "E:\" :> "/", "\" :> "/"]

f/@string//Column
(* 
/job/a/000251.png
/job/a/000254.png
/job/a/000253.png
/job/a/000256.png
/job/a/000255.png
/job/a/000258.png 
*)

edited 2 hours ago

answered 4 hours ago

halirutanâ™¦

92.8k5212405

edited 2 hours ago

answered 4 hours ago

halirutanâ™¦

92.8k5212405

answered 4 hours ago

halirutanâ™¦

92.8k5212405

answered 4 hours ago

halirutanâ™¦

92.8k5212405

I have the greatest admiration for your contributions. I am trying to follow your answer but I believe there is an error in the second definition of f. num is defined as a local constant in With but never used in the output. I would also appreciate it if you would show how to use f for the given example.
â€“Â Jack LaVigne
2 hours ago

@JackLaVigne Oh my goodness. There was so much wrong in my code because I didn't clear f for testing. Thank you for paying attention! Would you test if it works on windows with the original definition of strings?
â€“Â halirutanâ™¦
2 hours ago

Works fine in Windows. I was thinking I had to Map the function f`` over string`. Thank you for the update and example. It is clear to me now.
â€“Â Jack LaVigne
2 hours ago

It doesn't work for "/job/a/000258.png" where f returns "/job/a/0002510.png".
â€“Â Carl Woll
2 hours ago

@CarlWoll If you are on Windows, then this seems to be expected. Filename separators are OS specific and Mathematica's functions don't work if you are on Windows and try Unix files.
â€“Â halirutanâ™¦
2 hours ago

Â |Â
show 3 more comments

I have the greatest admiration for your contributions. I am trying to follow your answer but I believe there is an error in the second definition of f. num is defined as a local constant in With but never used in the output. I would also appreciate it if you would show how to use f for the given example.
â€“Â Jack LaVigne
2 hours ago

@JackLaVigne Oh my goodness. There was so much wrong in my code because I didn't clear f for testing. Thank you for paying attention! Would you test if it works on windows with the original definition of strings?
â€“Â halirutanâ™¦
2 hours ago

Works fine in Windows. I was thinking I had to Map the function f`` over string`. Thank you for the update and example. It is clear to me now.
â€“Â Jack LaVigne
2 hours ago

It doesn't work for "/job/a/000258.png" where f returns "/job/a/0002510.png".
â€“Â Carl Woll
2 hours ago

@CarlWoll If you are on Windows, then this seems to be expected. Filename separators are OS specific and Mathematica's functions don't work if you are on Windows and try Unix files.
â€“Â halirutanâ™¦
2 hours ago

I have the greatest admiration for your contributions. I am trying to follow your answer but I believe there is an error in the second definition of f. num is defined as a local constant in With but never used in the output. I would also appreciate it if you would show how to use f for the given example.
â€“Â Jack LaVigne
2 hours ago

@JackLaVigne Oh my goodness. There was so much wrong in my code because I didn't clear f for testing. Thank you for paying attention! Would you test if it works on windows with the original definition of strings?
â€“Â halirutanâ™¦
2 hours ago

Works fine in Windows. I was thinking I had to Map the function f`` over string`. Thank you for the update and example. It is clear to me now.
â€“Â Jack LaVigne
2 hours ago

It doesn't work for "/job/a/000258.png" where f returns "/job/a/0002510.png".
â€“Â Carl Woll
2 hours ago

@CarlWoll If you are on Windows, then this seems to be expected. Filename separators are OS specific and Mathematica's functions don't work if you are on Windows and try Unix files.
â€“Â halirutanâ™¦
2 hours ago

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