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Make startswith, endswith work with Regex #29790

Merged
merged 17 commits into from
Feb 1, 2019
1 change: 1 addition & 0 deletions base/pcre.jl
Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,7 @@ const COMPILE_MASK =
CASELESS |
DOLLAR_ENDONLY |
DOTALL |
ENDANCHORED |
EXTENDED |
FIRSTLINE |
MULTILINE |
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54 changes: 54 additions & 0 deletions base/regex.jl
Original file line number Diff line number Diff line change
Expand Up @@ -174,6 +174,60 @@ function occursin(r::Regex, s::SubString; offset::Integer=0)
r.match_data)
end

"""
startswith(s::AbstractString, prefix::Regex)

Return `true` if `s` starts with the regex pattern, `prefix`. Note:
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`occursin` is recommended over the regex version of `startswith` in
performance critical situations.

See also [`occursin`](@ref) and [`endswith`](@ref).

# Examples
```jldoctest
julia> startswith("JuliaLang", r"Julia|Romeo")
true
```
"""
function startswith(s::AbstractString, r::Regex)
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compile(r)
return PCRE.exec(r.regex, String(s), 0, r.match_options | PCRE.ANCHORED,
r.match_data)
end

function startswith(s::SubString, r::Regex)
compile(r)
return PCRE.exec(r.regex, s, 0, r.match_options | PCRE.ANCHORED,
r.match_data)
end

"""
endswith(s::AbstractString, suffix::Regex)

Return `true` if `s` ends with the regex pattern, `suffix`. Note:
`occursin` is recommended over the regex version of `endswith` in
performance critical situations.

See also [`occursin`](@ref) and [`startswith`](@ref).

# Examples
```jldoctest
julia> endswith("JuliaLang", r"Lang|Roberts")
true
```
"""
function endswith(s::AbstractString, r::Regex)
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compile(r)
return PCRE.exec(r.regex, String(s), 0, r.match_options | PCRE.ENDANCHORED,
r.match_data)
end

function endswith(s::SubString, r::Regex)
compile(r)
return PCRE.exec(r.regex, s, 0, r.match_options | PCRE.ENDANCHORED,
r.match_data)
end

"""
match(r::Regex, s::AbstractString[, idx::Integer[, addopts]])

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12 changes: 12 additions & 0 deletions test/regex.jl
Original file line number Diff line number Diff line change
Expand Up @@ -61,3 +61,15 @@ end
# 'a' flag to disable UCP
@test match(r"\w+", "Düsseldorf").match == "Düsseldorf"
@test match(r"\w+"a, "Düsseldorf").match == "D"

@test startswith("abc", r"a")
@test endswith("abc", r"c")
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@test !startswith("abc", r"b")
@test !startswith("abc", r"c")
@test !endswith("abc", r"a")
@test !endswith("abc", r"b")

@test !startswith("abc", r"A")
@test startswith("abc", r"A"i)
@test !endswith("abc", r"C")
@test endswith("abc", r"C"i)