libregex -- almost portable POSIX basic and extended Regular Expressions library. libregex is a small library, separate version which comes from musl libc, a size and memory efficient and unified libc for embedded systems and more. The goal of this library is to support or replace broken or missing regexp engines on non-compilant, embedded or size constraight systems and environments. libregex is based on TRE POSIX fully compatible regex engine. BUILDING Build with usual `make`. It will create libregex.a, which you can install anywhere, where your software looks for that library. To build for Android, you need to get Android NDK working, adjust environment to build target arch library with NDK this way (examples are given for host=linux-x86_64 and target=aarch64): export PATH=path/to/NDK/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH Then invoke `make` with your target triple name (example for API 21): make CC=aarch64-linux-android21-clang This will create libregex.a targeting Android aarch64 API 21. Then, you have to install two files: cp -a libregex.a path/to/NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/lib/aarch64-linux-android/21/ cp -a regex.h path/to/NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/ Your libregex installation for target is complete. You can now build software which requires it. To install on other hosts, just copy libregex.a and regex.h into appropriate places, usually /usr/lib and /usr/include respectively. Type `make all` to build regmatch test program. You can then run it to see if libregex.a is properly working. It takes two arguments for test: pattern to compile for, and string to match. Example: make all ./regmatch '^(a|b|)$' b It will print "matches" if string is matched by pattern, "nomatch" if it doesn't match pattern, or error string returned by regerror(3) in case of bad pattern or system failure. COPYRIGHT MIT License same as musl's, see COPYRIGHT file, with changes done by me. regmatch.c: MIT License.