### Author:  [@Dan](https://discourse.julialang.org/u/Dan)
#### Post date: [December 1, 2017, 2:43am UTC](https://discourse.julialang.org/t/regular-expressions-cant-insert-t-in-replacement-string/7419/4 "2017-12-01T02:43:21Z")
Writing explicitly `Base.SubstitutionString("y\t\\g")` might be a workaround.
---
### Author:  [@MLackner](https://discourse.julialang.org/u/MLackner)
#### Post date: [December 1, 2017, 7:42am UTC](https://discourse.julialang.org/t/regular-expressions-cant-insert-t-in-replacement-string/7419/5 "2017-12-01T07:42:32Z")
That does indeed work. Thank you!
---
### Author:  [@ScottPJones](https://discourse.julialang.org/u/ScottPJones)
#### Post date: [December 1, 2017, 1:22pm UTC](https://discourse.julialang.org/t/regular-expressions-cant-insert-t-in-replacement-string/7419/6 "2017-12-01T13:22:26Z")
The issue is really that the s"…" and r"…" strings have their own syntax, which is not compatible with the normal string escaping.
You’d need to either put the tab in directly (which makes it hard to read), or use @dan’s workaround (which is what I’ve done in the past)
---
### Author:  [@Dan](https://discourse.julialang.org/u/Dan)
#### Post date: [December 1, 2017, 1:38pm UTC](https://discourse.julialang.org/t/regular-expressions-cant-insert-t-in-replacement-string/7419/7 "2017-12-01T13:38:44Z")
A better version of the workaround is `@s_str("y\t\\f")`. Calling the macro directly without the tagged string literal, causes the string to be parsed with the regular escaping. Much shorter code.
The whole line is now:
```julia
println(replace("x 3", r"x (?\d*)", @s_str("d\t\\g")))
```
---
### Author:  [@ScottPJones](https://discourse.julialang.org/u/ScottPJones)
#### Post date: [December 1, 2017, 3:14pm UTC](https://discourse.julialang.org/t/regular-expressions-cant-insert-t-in-replacement-string/7419/8 "2017-12-01T15:14:08Z")
That’s a nice general technique!
---
### Author:  [@Liso](https://discourse.julialang.org/u/Liso)
#### Post date: [December 1, 2017, 10:06pm UTC](https://discourse.julialang.org/t/regular-expressions-cant-insert-t-in-replacement-string/7419/9 "2017-12-01T22:06:52Z")
Maybe I am wrong but still have feeling this is a bug:
```julia
julia> macro tst_str(string) println([i for i in string]) end;
# so far so good:
julia> @tst_str("a")
['a']
julia> tst"a"
['a']
# this is probably wanted to help create raw_str:
julia> @tst_str("\\a")
['\\', 'a']
julia> tst"\\a"
['\\', '\\', 'a']
# but there is a problem to add backslash at the end of string:
julia> @tst_str("a\\")
['a', '\\']
julia> tst"a\\"
['a', '\\', '\\']
julia> tst"a\" # 3times in REPL
ERROR: syntax: incomplete: invalid string syntax
```
Maybe enhance syntax for string macros could help? I mean something like:
```julia
macro a_str(a) # for raw "escaping"
macro a_estr(a) # for standard escaping
# but macros above would have problem with name clash...
a"how to interpret this o\ne?"
```
---
### Author:  [@Liso](https://discourse.julialang.org/u/Liso)
#### Post date: [December 18, 2017, 1:04am UTC](https://discourse.julialang.org/t/regular-expressions-cant-insert-t-in-replacement-string/7419/10 "2017-12-18T01:04:40Z")
> [@Liso](#):
>
> ```julia
> julia> tst"a\\"
> ['a', '\\', '\\']
>
> ```
🎉 At least Julia 0.7.0-DEV.2815:
```julia
julia> tst"a\\"
['a', '\\']
```