编辑“︁Template:Str mid/core”︁

{{#ifexpr:({{#if:{{{sublen|}}}|{{{sublen|}}}|1}}=0) or ({{{slen|1}}}=0)|<!--blank-->
 |{{#if:{{{triangle check|}}}|{{error|{{{triangle check|}}}}}
  |{{#invoke:String|sub
|s={{{s|}}}
|i={{#ifeq:{{{invert|no}}}|yes|{{{j|}}}|{{{i|}}}}}
|j={{#ifeq:{{{invert|no}}}|yes|{{{i|}}}|{{{j|}}}}}
|ignore_errors={{{ignore_errors|false}}}
|{{#if:{{{error_category|}}}|error_category={{{error_category|}}}}}
|no_category={{{no_category|false}}}<!--
-->}}}}}}<!--
-->{{yesno|{{{dbg|no}}}
|yes={{{dbg_in|}}}_CORE:slen:{{{slen|u}}}_i={{{i|u}}}_j={{{j|u}}}_inv={{{invert|u}}}_tchk={{#if:{{{triangle check|}}}|TCHK|-}}_blankexpr:{{#expr:({{#if:{{{sublen|}}}|{{{sublen|}}}|1}}=0) or ({{{slen|1}}}=0)}}
}}<noinclude>

* {{tl|Str mid}}
* {{tl|Str mid/core}}
* {{tl|Str mid/testcases}}
</noinclude>