How to add space before and after contional operator in string?
I have the string e.g "number1<=number2&&number3>number4||number2=number4" and having operator list as -
var operators = new List<string> {"=", "!", "<", ">", ">=", "<=", "!=","||","&&"};
So expectation is need to introduce single space before and after the operator in string.
"number1 <= number2 && number3 > number4 || number2 = number4"
I have tried following option but its not working in case of eg. <, >=
public static string AddSpaceBeforeAndAfterOperator(string expression)
{
var operators = new List<string> {"=", "!", "<", ">", ">=", "<=", "!=", "||", "&&"};
foreach (var op in operators)
{
var index = expression.IndexOf(op, StringComparison.Ordinal);
if (index >= 0)
{
if (expression.Substring(index - 1) != " ")
{
expression = expression.Insert(index-1, " ");
}
expression = expression.Insert(index + op.Length + 1, " ");
}
}
return expression;
}
Note: Operator list is coming as random.
Any help appreciated!
c# string c#-4.0
asked Nov 15 '18 at 6:39
Sumit DeshpandeSumit Deshpande
1,62611326
add a comment |
I have the string e.g "number1<=number2&&number3>number4||number2=number4" and having operator list as -
var operators = new List<string> {"=", "!", "<", ">", ">=", "<=", "!=","||","&&"};
So expectation is need to introduce single space before and after the operator in string.
"number1 <= number2 && number3 > number4 || number2 = number4"
I have tried following option but its not working in case of eg. <, >=
public static string AddSpaceBeforeAndAfterOperator(string expression)
{
var operators = new List<string> {"=", "!", "<", ">", ">=", "<=", "!=", "||", "&&"};
foreach (var op in operators)
{
var index = expression.IndexOf(op, StringComparison.Ordinal);
if (index >= 0)
{
if (expression.Substring(index - 1) != " ")
{
expression = expression.Insert(index-1, " ");
}
expression = expression.Insert(index + op.Length + 1, " ");
}
}
return expression;
}
Note: Operator list is coming as random.
Any help appreciated!
c# string c#-4.0
asked Nov 15 '18 at 6:39
Sumit DeshpandeSumit Deshpande
1,62611326
You could construct a regex by "(" + string.Join("|", operators.Select(Regex.Escape)) + ")" and then doing a regex.Replace
– Klaus Gütter
Nov 15 '18 at 6:45
add a comment |
I have the string e.g "number1<=number2&&number3>number4||number2=number4" and having operator list as -
var operators = new List<string> {"=", "!", "<", ">", ">=", "<=", "!=","||","&&"};
So expectation is need to introduce single space before and after the operator in string.
"number1 <= number2 && number3 > number4 || number2 = number4"
I have tried following option but its not working in case of eg. <, >=
public static string AddSpaceBeforeAndAfterOperator(string expression)
{
var operators = new List<string> {"=", "!", "<", ">", ">=", "<=", "!=", "||", "&&"};
foreach (var op in operators)
{
var index = expression.IndexOf(op, StringComparison.Ordinal);
if (index >= 0)
{
if (expression.Substring(index - 1) != " ")
{
expression = expression.Insert(index-1, " ");
}
expression = expression.Insert(index + op.Length + 1, " ");
}
}
return expression;
}
Note: Operator list is coming as random.
Any help appreciated!
c# string c#-4.0
asked Nov 15 '18 at 6:39
Sumit DeshpandeSumit Deshpande
1,62611326
I have the string e.g "number1<=number2&&number3>number4||number2=number4" and having operator list as -
var operators = new List<string> {"=", "!", "<", ">", ">=", "<=", "!=","||","&&"};
So expectation is need to introduce single space before and after the operator in string.
"number1 <= number2 && number3 > number4 || number2 = number4"
I have tried following option but its not working in case of eg. <, >=
public static string AddSpaceBeforeAndAfterOperator(string expression)
{
var operators = new List<string> {"=", "!", "<", ">", ">=", "<=", "!=", "||", "&&"};
foreach (var op in operators)
{
var index = expression.IndexOf(op, StringComparison.Ordinal);
if (index >= 0)
{
if (expression.Substring(index - 1) != " ")
{
expression = expression.Insert(index-1, " ");
}
expression = expression.Insert(index + op.Length + 1, " ");
}
}
return expression;
}
Note: Operator list is coming as random.
Any help appreciated!
c# string c#-4.0
c# string c#-4.0
asked Nov 15 '18 at 6:39
Sumit DeshpandeSumit Deshpande
1,62611326
asked Nov 15 '18 at 6:39
Sumit DeshpandeSumit Deshpande
1,62611326
asked Nov 15 '18 at 6:39
Sumit DeshpandeSumit Deshpande
1,62611326
asked Nov 15 '18 at 6:39
Sumit DeshpandeSumit Deshpande
1,62611326
asked Nov 15 '18 at 6:39
Sumit DeshpandeSumit Deshpande
1,62611326
1,62611326
You could construct a regex by "(" + string.Join("|", operators.Select(Regex.Escape)) + ")" and then doing a regex.Replace
– Klaus Gütter
Nov 15 '18 at 6:45
add a comment |
You could construct a regex by "(" + string.Join("|", operators.Select(Regex.Escape)) + ")" and then doing a regex.Replace
– Klaus Gütter
Nov 15 '18 at 6:45
You could construct a regex by "(" + string.Join("|", operators.Select(Regex.Escape)) + ")" and then doing a regex.Replace
– Klaus Gütter
Nov 15 '18 at 6:45
You could construct a regex by "(" + string.Join("|", operators.Select(Regex.Escape)) + ")" and then doing a regex.Replace
– Klaus Gütter
Nov 15 '18 at 6:45
add a comment |
2 Answers
2
active
oldest
votes
I would recommend a regex solution.
First, you need to escape all your operators, join them together with |:
var operatorsString = string.Join("|",
operators.OrderByDescending(x => x.Length).Select(Regex.Escape).ToArray()
);
// OrderByDescending here because we want the longer operators to be matched first.
Next, create the regex:
var regex = $"\s*({operatorString})\s*";
Using the operators array in the question, the array looks like this:
s*(<=|>=|!=|==||||&&|=|!|<|>)s?*
Note that s* is used to check if the operator is already surrounded by spaces. If it is, those spaces will be matched and replaced.
The replacement is:
$1
Code:
Regex.Replace(input, regex, " $1 ");
Note the leading and trailing space.
Also note that Regex is inside the System.Text.RegularExpressions namespace.
Demo
answered Nov 15 '18 at 6:54
SweeperSweeper
68.8k1073140
Probably, a better choices*instead ofs?for "if the operator is already surrounded by spaces" (what if we have several spaces:"a___>=__b"?)
– Dmitry Bychenko
Nov 15 '18 at 7:55
@DmitryBychenko Good point. Edited.
– Sweeper
Nov 15 '18 at 8:21
@Sweeper - Thanks for the suggestion.
– Sumit Deshpande
Nov 16 '18 at 5:14
add a comment |
Im not sure if this is the most effective way to do this, but is is rally simple by using replace
public static string AddSpaceBeforeAndAfterOperator(string expression)
{
var operators = new List<string> { "=", "!", "<", ">", ">=", "<=", "!=", "||", "&&" };
foreach (var op in operators)
{
expression = expression.Replace(op, " " + op + " ");
}
return expression;
}
answered Nov 15 '18 at 6:47
Daniel W.Daniel W.
226111
2
Thanks for the suggestion, But this is not going to work in case of a scenario like "number1<=number2" it will end up returning "number1 < = number2" which is not correct
– Sumit Deshpande
Nov 15 '18 at 6:52
wont work for<=will result< =
– styx
Nov 15 '18 at 6:53
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
I would recommend a regex solution.
First, you need to escape all your operators, join them together with |:
var operatorsString = string.Join("|",
operators.OrderByDescending(x => x.Length).Select(Regex.Escape).ToArray()
);
// OrderByDescending here because we want the longer operators to be matched first.
Next, create the regex:
var regex = $"\s*({operatorString})\s*";
Using the operators array in the question, the array looks like this:
s*(<=|>=|!=|==||||&&|=|!|<|>)s?*
Note that s* is used to check if the operator is already surrounded by spaces. If it is, those spaces will be matched and replaced.
The replacement is:
$1
Code:
Regex.Replace(input, regex, " $1 ");
Note the leading and trailing space.
Also note that Regex is inside the System.Text.RegularExpressions namespace.
Demo
answered Nov 15 '18 at 6:54
SweeperSweeper
68.8k1073140
Probably, a better choices*instead ofs?for "if the operator is already surrounded by spaces" (what if we have several spaces:"a___>=__b"?)
– Dmitry Bychenko
Nov 15 '18 at 7:55
@DmitryBychenko Good point. Edited.
– Sweeper
Nov 15 '18 at 8:21
@Sweeper - Thanks for the suggestion.
– Sumit Deshpande
Nov 16 '18 at 5:14
add a comment |
I would recommend a regex solution.
First, you need to escape all your operators, join them together with |:
var operatorsString = string.Join("|",
operators.OrderByDescending(x => x.Length).Select(Regex.Escape).ToArray()
);
// OrderByDescending here because we want the longer operators to be matched first.
Next, create the regex:
var regex = $"\s*({operatorString})\s*";
Using the operators array in the question, the array looks like this:
s*(<=|>=|!=|==||||&&|=|!|<|>)s?*
Note that s* is used to check if the operator is already surrounded by spaces. If it is, those spaces will be matched and replaced.
The replacement is:
$1
Code:
Regex.Replace(input, regex, " $1 ");
Note the leading and trailing space.
Also note that Regex is inside the System.Text.RegularExpressions namespace.
Demo
answered Nov 15 '18 at 6:54
SweeperSweeper
68.8k1073140
Probably, a better choices*instead ofs?for "if the operator is already surrounded by spaces" (what if we have several spaces:"a___>=__b"?)
– Dmitry Bychenko
Nov 15 '18 at 7:55
@DmitryBychenko Good point. Edited.
– Sweeper
Nov 15 '18 at 8:21
@Sweeper - Thanks for the suggestion.
– Sumit Deshpande
Nov 16 '18 at 5:14
add a comment |
I would recommend a regex solution.
First, you need to escape all your operators, join them together with |:
var operatorsString = string.Join("|",
operators.OrderByDescending(x => x.Length).Select(Regex.Escape).ToArray()
);
// OrderByDescending here because we want the longer operators to be matched first.
Next, create the regex:
var regex = $"\s*({operatorString})\s*";
Using the operators array in the question, the array looks like this:
s*(<=|>=|!=|==||||&&|=|!|<|>)s?*
Note that s* is used to check if the operator is already surrounded by spaces. If it is, those spaces will be matched and replaced.
The replacement is:
$1
Code:
Regex.Replace(input, regex, " $1 ");
Note the leading and trailing space.
Also note that Regex is inside the System.Text.RegularExpressions namespace.
Demo
answered Nov 15 '18 at 6:54
SweeperSweeper
68.8k1073140
I would recommend a regex solution.
First, you need to escape all your operators, join them together with |:
var operatorsString = string.Join("|",
operators.OrderByDescending(x => x.Length).Select(Regex.Escape).ToArray()
);
// OrderByDescending here because we want the longer operators to be matched first.
Next, create the regex:
var regex = $"\s*({operatorString})\s*";
Using the operators array in the question, the array looks like this:
s*(<=|>=|!=|==||||&&|=|!|<|>)s?*
Note that s* is used to check if the operator is already surrounded by spaces. If it is, those spaces will be matched and replaced.
The replacement is:
$1
Code:
Regex.Replace(input, regex, " $1 ");
Note the leading and trailing space.
Also note that Regex is inside the System.Text.RegularExpressions namespace.
Demo
answered Nov 15 '18 at 6:54
SweeperSweeper
68.8k1073140
edited Nov 15 '18 at 8:20
answered Nov 15 '18 at 6:54
SweeperSweeper
68.8k1073140
answered Nov 15 '18 at 6:54
SweeperSweeper
68.8k1073140
answered Nov 15 '18 at 6:54
SweeperSweeper
68.8k1073140
68.8k1073140
Probably, a better choices*instead ofs?for "if the operator is already surrounded by spaces" (what if we have several spaces:"a___>=__b"?)
– Dmitry Bychenko
Nov 15 '18 at 7:55
@DmitryBychenko Good point. Edited.
– Sweeper
Nov 15 '18 at 8:21
@Sweeper - Thanks for the suggestion.
– Sumit Deshpande
Nov 16 '18 at 5:14
add a comment |
Probably, a better choices*instead ofs?for "if the operator is already surrounded by spaces" (what if we have several spaces:"a___>=__b"?)
– Dmitry Bychenko
Nov 15 '18 at 7:55
@DmitryBychenko Good point. Edited.
– Sweeper
Nov 15 '18 at 8:21
@Sweeper - Thanks for the suggestion.
– Sumit Deshpande
Nov 16 '18 at 5:14
Probably, a better choice
s* instead of s? for "if the operator is already surrounded by spaces" (what if we have several spaces: "a___>=__b"?)– Dmitry Bychenko
Nov 15 '18 at 7:55
Probably, a better choice
s* instead of s? for "if the operator is already surrounded by spaces" (what if we have several spaces: "a___>=__b"?)– Dmitry Bychenko
Nov 15 '18 at 7:55
@DmitryBychenko Good point. Edited.
– Sweeper
Nov 15 '18 at 8:21
@DmitryBychenko Good point. Edited.
– Sweeper
Nov 15 '18 at 8:21
@Sweeper - Thanks for the suggestion.
– Sumit Deshpande
Nov 16 '18 at 5:14
@Sweeper - Thanks for the suggestion.
– Sumit Deshpande
Nov 16 '18 at 5:14
add a comment |
Im not sure if this is the most effective way to do this, but is is rally simple by using replace
public static string AddSpaceBeforeAndAfterOperator(string expression)
{
var operators = new List<string> { "=", "!", "<", ">", ">=", "<=", "!=", "||", "&&" };
foreach (var op in operators)
{
expression = expression.Replace(op, " " + op + " ");
}
return expression;
}
answered Nov 15 '18 at 6:47
Daniel W.Daniel W.
226111
2
Thanks for the suggestion, But this is not going to work in case of a scenario like "number1<=number2" it will end up returning "number1 < = number2" which is not correct
– Sumit Deshpande
Nov 15 '18 at 6:52
wont work for<=will result< =
– styx
Nov 15 '18 at 6:53
add a comment |
Im not sure if this is the most effective way to do this, but is is rally simple by using replace
public static string AddSpaceBeforeAndAfterOperator(string expression)
{
var operators = new List<string> { "=", "!", "<", ">", ">=", "<=", "!=", "||", "&&" };
foreach (var op in operators)
{
expression = expression.Replace(op, " " + op + " ");
}
return expression;
}
answered Nov 15 '18 at 6:47
Daniel W.Daniel W.
226111
2
Thanks for the suggestion, But this is not going to work in case of a scenario like "number1<=number2" it will end up returning "number1 < = number2" which is not correct
– Sumit Deshpande
Nov 15 '18 at 6:52
wont work for<=will result< =
– styx
Nov 15 '18 at 6:53
add a comment |
Im not sure if this is the most effective way to do this, but is is rally simple by using replace
public static string AddSpaceBeforeAndAfterOperator(string expression)
{
var operators = new List<string> { "=", "!", "<", ">", ">=", "<=", "!=", "||", "&&" };
foreach (var op in operators)
{
expression = expression.Replace(op, " " + op + " ");
}
return expression;
}
answered Nov 15 '18 at 6:47
Daniel W.Daniel W.
226111
Im not sure if this is the most effective way to do this, but is is rally simple by using replace
public static string AddSpaceBeforeAndAfterOperator(string expression)
{
var operators = new List<string> { "=", "!", "<", ">", ">=", "<=", "!=", "||", "&&" };
foreach (var op in operators)
{
expression = expression.Replace(op, " " + op + " ");
}
return expression;
}
answered Nov 15 '18 at 6:47
Daniel W.Daniel W.
226111
answered Nov 15 '18 at 6:47
Daniel W.Daniel W.
226111
answered Nov 15 '18 at 6:47
Daniel W.Daniel W.
226111
answered Nov 15 '18 at 6:47
Daniel W.Daniel W.
226111
226111
2
Thanks for the suggestion, But this is not going to work in case of a scenario like "number1<=number2" it will end up returning "number1 < = number2" which is not correct
– Sumit Deshpande
Nov 15 '18 at 6:52
wont work for<=will result< =
– styx
Nov 15 '18 at 6:53
add a comment |
2
Thanks for the suggestion, But this is not going to work in case of a scenario like "number1<=number2" it will end up returning "number1 < = number2" which is not correct
– Sumit Deshpande
Nov 15 '18 at 6:52
wont work for<=will result< =
– styx
Nov 15 '18 at 6:53
2
2
Thanks for the suggestion, But this is not going to work in case of a scenario like "number1<=number2" it will end up returning "number1 < = number2" which is not correct
– Sumit Deshpande
Nov 15 '18 at 6:52
Thanks for the suggestion, But this is not going to work in case of a scenario like "number1<=number2" it will end up returning "number1 < = number2" which is not correct
– Sumit Deshpande
Nov 15 '18 at 6:52
wont work for
<= will result < = – styx
Nov 15 '18 at 6:53
wont work for
<= will result < = – styx
Nov 15 '18 at 6:53
add a comment |
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You could construct a regex by "(" + string.Join("|", operators.Select(Regex.Escape)) + ")" and then doing a regex.Replace
– Klaus Gütter
Nov 15 '18 at 6:45